@hund AFAIK the 5X and 6P HW triggered bootloops can be fixed on many devices by disabling 4 big cores and let in run on 4 small ones from the big.little arch. Friend of mine was successfull in reviving his 5X using the bootloader/kernel patch from the xda. more on that topic here:
if you still have the phone, it's worth a try or two.
may the force be with you.
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