I just wish there was a way to downgrade from Brains to the old Bitmain FW, can't do it no matter how i try as some 2 cards work on the older 2017/2018/2019 FW?
There must be a way, i stupidly presumed that when i upgraded to brains that my SSH locked boards that i had to flash to NAND with SD card removed the lock, hence allowing you to downgrade if needed.
I can't find/see a way to remove Brains?
That's what bos-toolbox uninstall does, it puts factory fw from 2018 (which has ssh unlocked). sd recovery also works with the S9 family only.
From what you describe, you have a hardware issue. A power fluctuation could easily damage your PSU causing that error.
Various things to check/try, in no specific order:
- Make sure the device is connected to ground at all times (case and psu).
- Check all settings are default (Delete any value, then Save & Apply).
- Try reducing power limit. Wait at least 12 hours for Tuner Status to show Stable.
- Check the cables are well connected, try swapping or replacing them, tighten the power rail screws.
- Disable the hashboard in Configuration > Performance > Override Global Hash Chain about 6 hours.
- Try with another power supply unit, problems with the PSU can also manifest as HW errors.
- Clean the device carefully, if you use liquids you should wait a few days to dry fully.
If the problem persists, it probably has a physical issue that needs repair.
I seldom read other threads (this forum is too large), so you should have listened to what BitMaxz said.
Issue was water damage by the looks.
I definitely need to look inti bos-toolbox, i did download it and did find it somewhat confusing tbh, then after reading on here some where saying it's main use is for large mining farms, mass flashing/control of 100's of miners etc and people were doing it simply via SD card, so i went with that and found the process simple and i only have several miner.
Cheers