Can't downgrade S21

[Passosrj]

I have an issue while trying to downgrade my S21.

Some days ago my S21 stopped to recognize some chips. I think it's a problem with some of the hashboard and I will need to find someone able to fix it here in Brazil - and that's a tough thing to do.

I had an idea to install the vnish firmware to force it to run without one of the hashboards but I have the latest firmware installed - FR-1.12(251009-S21).

I did download of the version for "unlock" the ASIC to get it able to receive the vnish firmware. I did it to a formatted(FAT32) pen drive(8 Gb) USB2.0. I boutgh an OTG Cable(bought 3 types of it until now) to plug it into the ASIC, but when I do the process to downgrade, it simple doesn't run.

I have tried to change the pen drive model, OTG cable model and even the sites where I download the firmware, but it doesn't work. I turn the ASIC off, plug the OTG cable with the pen drive and then I turn the asic ON. After that the ASIC just run as it was without the OTG cable. Doing a normal initialization.

Have you ever happened to you?

I don't know what to do but I really need to put this ASIC to work.

Wish someone help me

Thank you

[philipma1957]

I have an issue while trying to downgrade my S21.

Some days ago my S21 stopped to recognize some chips. I think it's a problem with some of the hashboard and I will need to find someone able to fix it here in Brazil - and that's a tough thing to do.

I had an idea to install the vnish firmware to force it to run without one of the hashboards but I have the latest firmware installed - FR-1.12(251009-S21).

I did download of the version for "unlock" the ASIC to get it able to receive the vnish firmware. I did it to a formatted(FAT32) pen drive(8 Gb) USB2.0. I boutgh an OTG Cable(bought 3 types of it until now) to plug it into the ASIC, but when I do the process to downgrade, it simple doesn't run.

I have tried to change the pen drive model, OTG cable model and even the sites where I download the firmware, but it doesn't work. I turn the ASIC off, plug the OTG cable with the pen drive and then I turn the asic ON. After that the ASIC just run as it was without the OTG cable. Doing a normal initialization.

Have you ever happened to you?

I don't know what to do but I really need to put this ASIC to work.

Wish someone help me

Thank you

you need a new controller.

my sponsor altairtech sells the epic controller.

it will let you use 1 ,2 ,3 hashboards. it will also let you under clock a bit.


my signature links to their website and I would get a fee.

or this link directly goes to the controller you need to use.

https://altairtech.io/product/epic-umc-universal-mining-control-board/

get the one for s21

whether you use my referral or the direct link this is likely what you need to do as new bitmain firmware locks the controllers .


good luck

[BitMaxz]

I don't think you can downgrade, the latest firmware has a signature check you can't able to downgrade them but try the SD card firmware from this link below under SD card.

- https://www.zeusbtc.com/firmware-download/details/4957-antminer-21-series-firmware-download

If it does not work you don't have a choice but to try modded/custom firmware like Braiins/Vnish firmware or your last hope is to use the epic controller as suggested above.

[Passosrj]

I have an issue while trying to downgrade my S21.

Some days ago my S21 stopped to recognize some chips. I think it's a problem with some of the hashboard and I will need to find someone able to fix it here in Brazil - and that's a tough thing to do.

I had an idea to install the vnish firmware to force it to run without one of the hashboards but I have the latest firmware installed - FR-1.12(251009-S21).

I did download of the version for "unlock" the ASIC to get it able to receive the vnish firmware. I did it to a formatted(FAT32) pen drive(8 Gb) USB2.0. I boutgh an OTG Cable(bought 3 types of it until now) to plug it into the ASIC, but when I do the process to downgrade, it simple doesn't run.

I have tried to change the pen drive model, OTG cable model and even the sites where I download the firmware, but it doesn't work. I turn the ASIC off, plug the OTG cable with the pen drive and then I turn the asic ON. After that the ASIC just run as it was without the OTG cable. Doing a normal initialization.

Have you ever happened to you?

I don't know what to do but I really need to put this ASIC to work.

Wish someone help me

Thank you

you need a new controller.

my sponsor altairtech sells the epic controller.

it will let you use 1 ,2 ,3 hashboards. it will also let you under clock a bit.


my signature links to their website and I would get a fee.

or this link directly goes to the controller you need to use.

https://altairtech.io/product/epic-umc-universal-mining-control-board/

get the one for s21

whether you use my referral or the direct link this is likely what you need to do as new bitmain firmware locks the controllers .


good luck

Thank you for helping me. Nice to see that is possible to ship to Brazil

This one can run the vnish firmware? Asking because I don't know about the ePIC firmware.

Also I have another question. Is it possible to force the ASIC to run with the hashboard that "has" less chips? I think my ASIC recognize 98% of the chips 

[philipma1957]

no but the epic firmware will do everything you need.

i have thread on the epic running the t21

wait for link

https://bitcointalk.org/index.php?topic=5568422.0

that will show you the epic running 1 board and or 2 boards

it also will show you each and every chip

how hot
and how much hash rate..

for each and every chip

your other option is try to find a s21 with old firmware on it .

on ebay.

[FP91G]

Before flashing Vnish, I strongly recommend contacting their technical support for advice. Not all ASIC models and firmware versions can be flashed. You'll then have to buy a new controller; many miners have already encountered this error. Be especially careful with the 21 series. Spare parts for the 19 series are inexpensive.

[igorokkk]

https://vnish.group/en/en_aml_unlock/