So you need disaster recovery via usb.
prepare a (switch recognized) USB stick (test with "usb enable" "cd /uflash" "dir" on other switch)
create directory 6350 on stick
create directory certified inside /6350 on stick
copy AOS Image files to /6350/certified
plug in usb stick
reboot switch (watch console)
I've done this procedure on the 6450 many many times, but on the 6350 it's not working as it should. Interestingly, if a folder /6250/certified/ is created, the switch attempts to access it. However, it will not load the 6350 image-files if they're put into it. Renaming doesn't seem to work either.
I've figured it out. At this time I believe the stock miniboot on the switch is either bugged or the incorrect image. I've changed my support case to have this guess confirmed.
The way to recover a formatted flash from the USB Stick is quite simple, even with the wrong stock miniboot. This method requires the USB Stick to be set up correctly and plugged in.
After a very tedious conversation with three different people from ALE's support desk, after 2 months, they've finally believed me that this bug exists.
R&D has referred to "PR#221216", suggesting that this is a known bug, which, according to them, has been fixed in version 6.7.1.127.R04 of miniboot. Unfortunately, they're unable (unwilling?) to provide any more information than that. The mentioned version is unavailable on the ALE Business portal, and the release notes of 6.7.1.137.R04 do not mention miniboot.
The bug persists in the stock miniboot of all 6350 that have been shipped to us. Miniboot needs to be 6.7.1.127.R04 or later, else the USB disaster recovery doesn't work, ever.
Thanks for all this info in this thread. I'm completely new to the AL OmniSwitch world, as I just bought an OS6350-P24 used for home use and learning, and would like to update it. I tried to look through the AL websites, but I didn't find any way to download the 6.7.2.R08 firmware update, and the URL mentioned in this thread is not working anymore.
As I don't have a way to get a business contract, could someone help me out in private with these files? You can contact me on gergely dot risko at gmail dot com.