How can I fix color banding issue myself non root and also get pure deep blacks.

Please tell us some basic information before asking for help:
- Model Name:
- Firmware Version:
- Rooted or not:
- Frequency of Occurrence:
- 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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Comments
By buying a new phone🤪
As far as I'm aware, the only way to fix it yourself is to unlock the bootloader (not the same as root) and install a custom kernel. I'm not sure if there are any publicly available custom kernels that fix this, but if there are, doing so will likely void your warranty (if you have one).
dis is pretty much accurate.