Upgrading or repairing the EROM (FOTA) in phones CID 49 or CID 51 with Phone XS

[Simri]

Isn't CID OTP is CID when the phone first out from SE factory? This can't be upgradeded.

Yes

The OTP CID (One Time Programmable memory) and EROM CID of a phone might be protected by different CIDs, usually the case in newer phones.

EROM CID= Phone CID