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Plug in a USB keyboard, then repeatedly press ALT + PRINT SCREEN + E. This will take your head unit into forced firmware update (I think). After doing it repeatedly the unit told ME that it was doing firmware update (but no usb with update was plugged in). To another person in another forum that had the unit bricked it told him (after several presses) that there was an issue with his firmware and to rollback. Everytime you press the combination, the touch stops responding, after a couple seconds it reboots. If you press the combination BEFORE it boots you will see weird lines on the screen. It will restart itself. If you keep doing it, it will eventually tell you that its a firmware update or, in the other case, will tell you if you can rollback the FW. CTRL + ALT + DEL will reboot the unit (Tested on a Hyundai Ioniq hybrid early 2019 EU)

(this is written thanks to Sonic Sniper in this forum, I am just writing it here so people can find it on google or any other search engine)
 
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