The OnePlus 8T, while running Android 13, is facing persistent update errors. Users encountering these errors report issues downloading and applying delta updates, resulting in a permanent lock to the current software version. The error messages point to hash mismatches between the expected and calculated values of the source data partition, suggesting a potential conflict with the currently installed system software. These issues are particularly concerning for devices without a compatible TWRP recovery, as they preclude the possibility of manually flashing updates to resolve the problem.
This article will explore the potential causes of these update failures and look into possible solutions to help OnePlus 8T users bypass the update roadblock and get their devices back on track.
**Key error messages observed:**
```
E/update_engine( 2082): [1205/130621.176402:ERROR:verified_source_fd.cc(50)] Unable to open ECC source partition /dev/block/bootdevice/by-name/boot_a: Success (0)
E/update_engine( 2082): [1205/130621.176516:ERROR:partition_writer.cc(362)] The hash of the source data on disk for this operation doesn't match the expected value. This could mean that the delta update payload was targeted for another version, or that the source partition was modified after it was installed, for example, by mounting a filesystem.
... [More error messages]
```
**Possible Causes and Solutions:**
Investigating the potential causes behind these update failures is crucial for finding effective solutions.
* **Corrupted System Files:** The mentioned hash mismatches could indicate corrupted system files within the `/dev/block/bootdevice/by-name/boot_a` partition.
* **Incompatible Updates:** The update payload might be designed for a different version of Android or a modified system configuration, leading to the hash mismatch.
* **TWRP Issue:** If a supported recovery like TWRP isn't available, manually flashing a working update becomes impossible.
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