My Phone just died after few days of android 11 update

[ZT-7f9ab711]

Please tell us some basic information before asking for help:
Model Name: Asus 6z
Firmware Version:can't tell as I couldn't start it...
Rooted or not: not
Frequency of Occurrence: just this time... haven't got another chance
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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[Paladin]

Update:
This is the best New Year gift. The Repair Hospital fixed my Zenfone 6 and it is now working. They replaced the board for SGD 165. Just Google The Repair Hospital Suntec Singapore.
Considering, I'm still paying for the phone via installment plan, the repair cost is well worth the expense. They did what ASUS Service Centre in Singapore would NOT do. To be fair, this model is not available in Singapore. So maybe they did not have the parts.
Blessed New Year to all 🙂

[Scooo]

Congratulations on having your phone restored to the original working condition!

Can you please elaborate as to what the technicians said could have been the cause?
Also describe the board you're talking about which was replaced, please!

Thanks,
Scooo.