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TESTED FIRMWARE
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If you are experiencing a restart problem with your Oppo 1105 after flashing, there are several steps you can take to try and fix the issue:

Clear Cache Partition: Boot your Oppo 1105 into Recovery Mode and select the "Wipe cache partition" option. This will clear out any residual files that might be causing the restart issue.

Re-flash the ROM: If clearing the cache partition does not resolve the issue, you can try re-flashing the ROM. Make sure to download the correct ROM for your device and follow the flashing instructions carefully.

Factory Reset: If neither of the above steps work, you can try doing a factory reset on your Oppo 1105. This will erase all data on your device, so make sure to backup important files before proceeding.

Battery Replacement: In some cases, the issue may be related to a faulty battery. Try replacing the battery with a new one and see if that resolves the restart problem.

If none of the above steps work, it may be best to take your Oppo 1105 to a professional repair shop to diagnose and fix the issue.