Hello guys, just to let you know:Yup. done that.
anyway just used QFIL to flash to 11.5.381 and phone back to life. now ready to go in another cycle to flash to LineageOS18.1 again
Update I managed to flash to LineageOS18.1 right after moved to 11.5.381. seem like there is a MUST. all good so far only camera cant launched..will flash google camera ...happy!
i was in a quite similar situation like cheensiong.
Had bought the phone stock with the global rom and only managed to get the bootloader unlocked. LineageOS recovery didnt worked, but TWRP Recovery worked fine. After installation of Firmware cn12.5.262 and LineageOS18.1 i got stuck with Qualcomm Crash Dump. Then i reflashed successful to Chinese CN11.1.105 via the QPST tool from Qualcomm and tried it all over. Again, got stuck with CrashDump.
Finally i flashed CN11.5.381 and after this i got LineageOS18.1 working.
Now iam happy and i hope this Information is useful