Possibly the 3rd board is faulty or overheating.

Better check the dashboard of this miner under the miner's status to see which one isn't working.

And read the kernel logs for possible errors you should see why it's not working.
Like the above  said post the kernel logs here so that we can see the cause of why it isn't working.

You can also try to test all hash boards one by one to find the culprit you can follow the guide below.

- https://www.zeusbtc.com/articles/asic-miner-troubleshooting/1050-how-to-test-antminer-hash-board-one-by-one

Be careful of importing private keys on an online PC before you import and do the guide above always make sure to disconnect your PC from the internet to avoid leaks.

Or better generate your new address with your current wallet than expose your private key.

What do you plan for this address? If you are going to deposit then it's not safe but if you plan to transfer funds from that address make sure to send it to a secured wallet/address.

That pattern will not work in the long term it only works in the short time.
Nowadays is not easy to predict the crypto price movement analyzing the market only helps you decide and know when to buy or sell sometimes analyzing them will work but sometimes it doesn't always keep in your mind that Crypto is unpredictable.

As you can see in your chart with Fetch.ai/Tether and most of the tokens/coins out there they are rising due to the recent bitcoin rise.

If I were you since you don't know yet how to analyze the coin/token learn about FA and TA and some strategies from this link below and don't worry few tools from that link is free where you can test your skills and strategies.

- https://github.com/SpiralDevelopment/Awesome-Crypto-Trading

I've experienced having a phone with a bootloader unlocked/rooted with a custom OS and there are lots of ads after installing a few apps like shareit and browsing on some sites with hidden scripts that auto-install apps and notifications without your consent. So it's too risky if you are going to unlock the bootloader because some apps can do whatever they want to do with your phone.

And about the Go keyboard, they actually record the text you type most of the guides out there using it as a keylogger.
And sometimes some systems become corrupted due to bugs and malware that can turn your device into hardbrick you can fix this hardbrick but the problem is if you are using Qualcomm devices it needs to use a Jtag to be able to recover it from hardbrick only professional tech have this Jtag box.
Samsung phones also disable Knox protection if you unlocked the bootloader I never unlocked my phone because most of my exchange apps and wallet are in my phone.

Only unlocked bootloader if you want to do some experiment or test something just make sure don't use it to any sensitive data.

I think this is just for traders. Why not hold your coins instead I don't think holding coins is illegal since you are not trading them for local currency it should be fine.

And I suggest do all transactions privately if ever you use BTC an online VPN and incognito/private browsing should protect your privacy. Just don't exchange all your crypto for local currency until central banks approve it. You can still exchange them in the future or move to other countries where crypto is legal.

I don't see or find it on Electrum release notes that they will remove the cancel double spend.
So if you upgrade it to the latest version that function should be still there and even without that function you can manually cancel the double spend transaction except on non-RBF transactions.

Honestly, no one knows what will be the next price movement of Bitcoin but if you already know the history of Bitcoin since before then investing your savings into Bitcoin is a good choice.
However, since Bitcoin is volatile there is also a chance that Bitcoin may drop again below $20k so if you don't want to lose that chance invest only 30% on the current price and then the remaining 30% invest it again when the price drop below $20k or depending on how much you want to invest.

And take note there are many newbies lost due to selling their coins early when they see price drop you must learn to control your feelings because Bitcoin is for long-term investment not for day trading.

You can also downgrade the s19 series to a lower version through SD card flashing but the problem their live download page isn't showing SD card images.

But you can still download it from the archive.org here below

- https://web.archive.org/web/20220206132736/https://shop.bitmain.com/support/download?product=Flashing%20SD%20card%20with%20image

Don't click the download instead right-click then copy the link and paste it to another tab make sure to delete the archive.org link before you enter.
Then follow the instruction here on how to flash it through SD card.

About Whatsminer it seems there is no way to disable ASICboost because I think their units don't have ASICboost.

Are trying to mine on Nicehash? I heard that the new Whatsminer units do not support ASICboost pools if you have problem connecting to any pool try to use a pool with no ASICboost or that can switch to non-ASICboost server.

It seems that they randomly banned users according to their reviews you might be banned or your account is terminated.
According to their legal page before they terminate your account you should receive a 2 months notice so try to check your email for account termination you might get the reason why you can't able to log in.

You can also try to contact them with their email hello@roqqu.com or their live support that you can find directly on their home page.

I don't think there is a way to directly load the blockchain without reindexing It is required to reindex to rebuild blockchain data and to check some corrupted files and re-downloaded them.
Without reindexing, you might get some issues using your node like missing transactions, etc.

However, if you want to speed up reindexing there is a way like switching to SSD it can improve reindex speed process compared to HDD.

Canaan units are cheap and both your units that you mention are stable the only problem is that their units are power-hungry.
But if you have a cheap electricity rate Canaan units is a good choice than Antminer units.

Take note you can only mine Bitcoin with ASIC based machine so CPU and GPU are no longer supported. Even if it is supported it's not profitable due to difficulty.

If I were you better start reading this "First time/Small miner reference for getting started."

If you still decided to mine bitcoin then for cheap units Canaan.io units are cheap but power-hungry Antminer units is also a great option their latest units is the highest profitability due to efficiency.

I'd disagree with using 3rd party keyboard like Gboard you must use a built-in keyboard for your safety unless you are using a Chinese phone.

Chinese phones are not secured I have a few clone phones here never use them for any crypto transaction it would be safer if you have iPhone or Samsung(w/ Knox secured) and then use their built-in keyboard with disabled auto-suggest and sensors off from developers option.

So it is a CPA website?
What CMS do you use from your site?
Are you using WordPress?
BTCpay is the best option to this check the link below.

- https://docs.btcpayserver.org/PullPayments/

You don't need any 3rd party service it is safer and open-source than using APIs from other wallet. Check the documentation from the link above.

Sometimes they do get a very small hashrate from your miner just like other firmware with a developer's fee of around 2% to 10% without you notice.

That is why if you buy a used miner it is always recommended to flash them through an SD card and then upgrade it to the latest firmware to make sure you are using clean firmware. Dev fees don't affect much if you only have one miner but for those who have big farms, a 2 to 10% dev fee is a big loss.

That's a normal value if it's coming from the power supply and actually the power changes depending on the control board signal that is why you see some different power output and also you can adjust power and frequencies from this unit.

There is Vnish firmware where you can adjust power and frequencies or use auto-tuning and let it run for a while until it found the best freq and power for your miner to run stable.

Auto-tuning on BraiinsOS is also a good option as suggested above to test until you get some hints. But I guess PSU is working fine 1 of your hashboard is I think overheating after running for a while so auto-tuning is the best solution to still keep some chips running safely(From red to green).

I don't know exactly what are you planning it is likely a dream?
You will never be a supply of Bitcoin since the supply of Bitcoins came from blocks being solved and rewarded.
So how can you be a Bitcoin supplier?

Or you might be talking about trading related to exchange inflow and outflow but I don't see if the market is crashing look at the Bitcoin price chart for 30 days it continuously rising.

Or I think you are offering something for a limited-time offer?

If you don't mind I would like to ask what service you offer to your users why would you pay them?

Maybe BTCpayserver can help you about paying your users the best thing about using BTCpayserver is that there is no 3rd party you can host this with your own machine unlike other wallets or services online they do have control of your wallets.

And how did you end up using block.io if you can do it manually with your wallet unless you want them to automate withdrawal in your own website where your users requesting for withdrawal or payout so BTCpayserver is the right choice for this and they do support LTC.

There is no best way to mine Bitcoin but for the safest way to mine Bitcoin do not invest in any cloud mining sites or NFT or any digital form with hashrate they are mostly a scam.

That's the big difference buying digital vs physical miner I will never invest again to any form of mining with digital even it is NFT because I already experienced to be scammed by some investment sites before.

Just keep your miner updated to the latest firmware and disable ssh.
Also, change your root admin password and keep your router to enable firewall protection for any attack, and don't access any website randomly that records your IP because sometimes they scan your IP for open ports.

And don't flash your units with random firmware that you downloaded from unknown sources there are lots of fake firmware out there be careful.