how do you know which firmware version you want to use .
For example the S19 has 2 firmware. One for miners before May 2021 and one for after October 15, 2021.
So what's the way to know which version u should be putting . I looked on the bitmain site and can't find the answer to that question
anyone know ?
Have you tried to read their firmware description it should explain which firmware you should flash.
Check this image below it was from the Bitmain firmware description for s19

Do not worry about flashing it to the most recent firmware you can able to revert it back by flashing it through SD card and only revert it back if you experienced some issue.
Well my question is regarding that picture exactly . How do i differentiate a S19 that should be on the May 2021 firmware vs one that should have the Oct 15 . The reason i ask if because when u SD recovery a S19 with issues , the firmware shown is the recovery one which is the same for both versions .
So unless you marked down what Firmware u had prior to SD flashing , you'd have no idea but i'm thinking there must be a way to tell no ?