btw now got other issue: went well till the reboot after having done:
Your device will now boot into twrp recovery, and flash the firefirefire bootlaoder. When done it will prompt you to reboot. Upon reboot you will get stuck on the "yellow triangle" screen of firefire fire.
fastboot oem idme bootmode 5002: after that there's still the yellow triangle and on the prompt it shows "<waiting for the device> and nothing happens
edit again: didn't see the message on the bottom for the power button -.-'
---------- Post added at 07:12 PM ---------- Previous post was at 07:07 PM ----------
nothing, still stuck on yellow triangle, pressing power button does nothing