i think i found usb downloader mode on pw3w
i will try to be as in depth as possible on how i did it
i have a jail broken pw3w via watch this jailbreak
with latest hotfix
list of hacks installed: koreader kual screensaver backdoor lock usbnet MRPI helper
i started a ssh client in koreader and ssh`d in via snowflake ssh client on ubuntu 18.04
ran the command: idme -d bootmode diags
exited koreader and rebooted
the kindle booted into diags
i ran some tests i forget witch option i clicked (somehow i cant get into diags anymore
) and there was a option for usb download mode