Probably not, I have never heart of them, aside from thierry4wd "hacked" versions of some of the original bitmain firmware or Vnish (Asic.to / Awoesmeminer there isn't another firmware that's widely known around the mining community in this forum at least.

In addition, why on earth do you want to overclock your T17/S17 gears? a while ago I replied to your thread complaining about losing a hashboard on your T17+, all of these 17 series gears have terrible solder/adhesive and overclocking them will only speed up the process of toasting those hashboards, if anything you should be looking for underclocking rather than overclocking, but hey, your gears - your call.

Changing the fan speed fixes the high temps on the other boards, it isn't going to fix the bad board, does your miner report lower temps on the two working chains? it MUST, and that should "prevent" the other two working boards from falling apart.


The_binary_Observer mentioned about this before, and my reply to him was:


If you want to go ahead with the "horizontal position" make sure the large heatsinks are facing the top, you must understand that the PCB is covered by 2 layers of heatsinks, one sits right on the top of the chip (they are lager in size and they are the once that tend to fall 99.99% of the time), if you would mistakenly position them in the wrong directing (facing down) you could expose them to more gravity and they might fall even faster.

In general you want to these gears to run as cool as possible so that the lousy solder paste doesn't get heated, so having your fans at 90-100% is without a doubt more effective than re-positioning the miner.

You probably need  "GBJ2506 power rectifier 1000v 25A", that looks like this one



This will 99% work for you, I have yet to touch one but I know that https://www.zeusbtc.com only sell spare parts that work for mining gears, and they have this product https://www.zeusbtc.com/RepairDetails.asp?ID=101 and it matches the 2506 you got on yours.

Having said that and to be 100% sure, I suggest you talk to kevin or whoever is in charge, simply contact their support and ask if this would work on your APW8 or whichever PSU you are trying to fix, those guys know their stuff very well so I would trust whatever they got to tell you.

First of all allow me to congratulate on your new firmware, I have a few questions regarding how are you planning to distribute the firmware, in other words how do you ensure that other people won't re-sell it, I understand that trusted people of the community like your first client Favebook won't be doing that, but what about others?

Also the price tag should be discussed in public IMO, pricing is very difficulty and it's almost impossible to get the perfect number that would work well for you and the clients, so perhabs a community discussion on the subject will be very helpful, of course you could ignore my suggestion and keep the sales private, I just  think it would sell out a lot better when price is known and the community "agrees" to it.

Not sure how I missed this Kernel log,  anyway below is the problem.


Your miner has a total of 12 temp sensors, so that is 4 on each board, now it simply can't communicate with any of the 4 sensors on the 3rd board (usually most left), but based on information I have collected and confirmed from different sources including my own and other memmber's experince, it's unlikely that all 4 sensors went bad, and it's more likely than not that one of the chips/heatsinks lost conductivity to the PCB and it causes this error, there are a few things you can try, chances are slim but there is always hope.

يمكنك البحث في قسم Services https://bitcointalk.org/index.php?board=52.0 عن اشخاص يبحتون عن ترجمة مابين اللغات التي تتقنها انت, ويمكنك ايضا انشاء موضوع جديد تعرض فيه خدماتك لكي تجلب الزبائن, يحبد ان تضع سيرة ذاتية حول خبرتك في مجال الترجمة وان كنت تمتلك اي شهادات بالخصوص, الدعاية هنا مجانية فقط تذكر ان تحترم القواعد, مثلا لايمكنك رفع موضوعك اكثر من مرة خلال 24 ساعة, وعند رفعه يجب عليك مسح منشور الرفع الاول.

حاليا في ظل "ركود " السوق الفرص لن تكون كثيرة ولكن بمجرد الانتعاش وعودة العملات والمنصات والمشاريع الجديدة سيكون هناك طلب على التجرمة من والى مختلف اللغات.

It is easy to calculate the block rewards because it is static (6.25 btc/block), the rest comes from the transaction fees which varies greatly and there is no way to figure out future blocks rewards, you could do something like taking the average block fees for the past month/year and get the average in %, if block fees are 10% then simply multiply your number by 1.1, but again all of these are rough estimations as long as you can't predict the future accurately.

The product above is sold in France so my guess is that the French use it, I know Italy make such cables too (Not sure if they do use it), anyway reading further about this matter in this topic, and if I understood it correctly it does say that NEC code (used in the U.S) allow for smaller N conductuer in certain cases, also in this article which uses the IEC code (Used in Europe) states the following:


These standards aren't so easy to understand, but my take on it is that in some SPECIAL cases (when you are 100% the load across all 3 phases will always be equal or pretty close to equal), using a smaller neutral conductor is fine, perhabs that's why these companies make these "3.5 cores" or else - nobody would use them, but having said that, it's always better SAFE than sorry, so just go for 4 cores of the same size that can handle 125% of the load.

NotFuzzyWarm understands these stuff much better than most people here, so perhabs he could chime in with some information.

Loyce, can we get an update on this graph? I also noticed that some of the old graphs are no longer avaiable, I wanted to have a look at my old record which was uploaded to tinypic.com and now they took it off.  , did you start uploading on loyce.club just recently?

It isn't really "labelled and sold" as such 4X16mm², but rather 3x16mm² + 1*8mm², maybe I haven't made that clear enough, here is an example:



So these cables could be "3x95 + 1x50" or 3x120 + 1x70, not sure about the U.K but i am sure this is international, if i am not mistaken, some people refer to it as 3.5 core cable instead of 4 cores, I mean who wouldn't want to save a ton of money when buying cables of extended length? espcially if it goes to a warehouse / garage that mostly uses 3-phase machines where current in N is always near 0?

With that being said, since you can't guarantee this in a standrad single phase operaiton like mining, it would be pretty risky to do so, it's safe to have N size just the same as the phase wire size.

Those temps are dope, i am glad it worked out for you, thierry4wd is indeed a skillful dude but he lacks financial support or else he would be on a different level now, I also like that fact that he is planning on a single time-payment rather than sharing your hash power.

Sadly since it's summer time, i can't ask you to test the overclocking settings on this miner, hopefully you can try them out a few months later when winter comes by.

For thierry4wd well done, make sure favebook gets free access for the updated versions of your firmware since he was nice enough to test it for you.

Yes 3 phases and one neutral, most 4 wire cables (1 large cable with 4 wires inside) has a neutral wire with just about half the cross section of the other wires used for L, simply put, in a perfectly balanced load system the current in N will be 0 amps, I suppose the techincal term is (3 phase star connection), you could use this equation to find out the N current:


source: https://www.quora.com/How-do-I-calculate-the-neutral-current-of-a-three-phase-transformer-under-unbalanced-load-conditions-and-under-balanced-load-conditions

So as long as you got all 3 phases drawing the same amp the current in N will be 0, and here is an example of all R,Y,B drawing 10 amps each

(10^2+10^2+10^2-10*10-10*10-10*10)^0.5 = 0 amps in N

Now let's assume R = 20a, Y = 40a and B = 60.

(20^2+40^2+60^2-20*40-40*60-60*20)^0.5 = 34.6A

Now assuming your total load is 120A so 40A on each phase, you go ahead and do your cable size and say you get 16mm2 can handle 64 amps, so you buy 16mm2*4 cable where in reality that cable will have 3*12mm2 + 1*8mm2 for N.

8mm2 is only good for half those 64 amps so that's 32 amps, despite the fact that on all phases you stay below 64 amps, just by having such an unbalanced load, the N will have to pass 34.6A where it could only handle 32A, and this causes the  netural to be set on fire and if by any chance it touches one of the phases, fireworks will start.

A safe approch we use here would be not buying those cables with 4 wires, but instead buy 4 seperate wires of the same size, and they assume that in the worst case your numbers will be:

(0^2+0^2+60^2-0*0-0*60-60*0)^0.5 (0 Amps on 2 phases and max amps on a single phase) will result in 60 amps on the N wire, so even the worst unbalance will survive, but such wiring cost alot more than going with the regular 1*4 cables, and since people "suppose" they have contorl over the load, it makes sense to go with the cheaper option and balance the load across all phases so that my N wire has close to 0 amps run through it.

208v isn't low enough to toast those PSUs, but running them on unregulated voltage can easily kill them, depending on the electricity infrastructure, voltage drops could be so severe and that 208v point might not have been there all the time, there is a chance that you got a bad batch if that was the case we would be hearing more complains from more people, I am fairly active on all mining groups across all things internet (this forum, telegram groups, FB, and etc.) bad/low-quality batches are usually heard off in a short period of time, so I tend to kind of negate the batch issue, because there is no way that they would make only 6 bad units.

So my thought which is the same as the initial one is that the PSUs are causing the issues, I haven't looked inside a Whatsminer PSU but I am pretty confined that all new PSUs are pretty hard to fix or at least hey were not made to be fixed, but there is always hope, what I would do is get a used/new PSU and test it on all those units, for obvious reasons in somewhere where you know your voltage is stable above 200v.

Not the case with M21s, I managed to run this in extremely hot days (beyond 40c) and honestly it runs way cooler and much better than MOST bitmain gears, but I understand that different models/batches will perform differently.


What was the voltage they ran on? the way you describe the issue tells me that your miners' PSUs weren't so happy with the voltage they had, either too high or too low.

هل تذكر نصيحتي لك بعدم الاكثار من الكروت على لوحة واحدة؟ اعتقد اني قد تكلمت عن هدا الموضوع اكتر من مرتين, كل مازاد عدد الكروت كل ماكترت المشاكل, وخصوصا عند تجاوز عدد 6 كروت, الان لديك مشكلة في احد هده الكروت او كرتين او اكثر, عليك ازالة الكروت واعادتها بالواحد, والكرت الدي يسبب المشاكل يعني انه بحاجة الا تعريف جديد او انه به مشكلة اخرى.

نصيحتي لك, ان كنت تريد الاستتمرار في الاستتمار في مجال التعدين, اشتري Motherboard جديدة بكامل ملحقاتها وقم بنقل كرتين الى اللوحة الجديدة اولا لتفادي مثل هده المشاكل في المستقبل وتانيا لكي تتيح لنفسك فرصة التطوير في المستقبل.

Not sure if my "vouch" counts, but thierry4wd is pretty well-known around the mining board, mainly in the software suboard, I am surprised that you two don't know each other.


Do you mind telling us more about the firmware, what does it do? did you manage to unlock the frequency and voltage features? also were you able to alter the temp-sensor to allow hashboards to mine if at least 1 out of 4 temp-sensors are detected?

2.78% difficulty drop along with 20% price increase is something I will take with absolute pleasure.  

However, i still wouldn't fomo just yet, we are back below 11k which could actually be just a minor correction, I still think that we MUST close this weekly candle above $10500 for us not to dip below current prices again, as far as difficulty goes, I highly doubt we see crazy jumps in the near future, remember that the largest supplier of mining gears is out-of-stock and facing some real internal issues, old gears alone won't be able to make any crazy jumps, I think if price goes up, difficulty will take a much longer time to catch up, and that is paradise for miners.

It won't stop mining at 80c, not even at 100c, or at least this is what the default firmware allowes you to go to, since S9 has a max temp of 135c 80c is pretty cool, and i have seen those S9 run above 100c for a very long time without a hitch, now going 200c is a different story, I believe that some of these custom firmware have an option to disable the fan-check function in cgminer use for immersion cooling) where fans are unplugged anyway, so maybe it was activated by default or you have mistakenly activated it? hard to tell, you have to check with the firmware devs to confirm that.

Now back to your T17e it does say "PCB max. 80" but that is far form reality, all these 17 series have a terrible solder that will fall-off with the slightest increase in temps, there is no exact figure that these gears will run safe, but the cooler the better, i believe your readings of "PCB temperature as 51C" is not bad at all.

You should define what does "no longer working" actually refer to? are they burnt? are they giving you a temp-sensor error? 0 asic? less than the total number of asics they should show?

There are plenty things that could go wrong with these low-quality hashboards, some will be easy to fix, some are just not worth it, so please go ahead and explain in details what is exactly wrong with these boards and I will be glad to help you.

So were expecting just about a 6% drop half way through the current epoch, and now in just 14 blocks we will have a 2.5% drop, so in other words we claimed up 3% after a massive 18% increase in price, which means if price didn't climb so fast we would be most likely have gotten more than 6% drop, my previous assumptions that we continue to go go lower in diff or stay flat was based on the fact that price wouldn't be going any higher, I still think that current prices of $10800 won't change the equation much, but if we close this week above $10500 chances are we go to $13900 in no time, and from there many things will change, even old obsolete gears will be able to come back online.