From recovery → “Wipe cache partition” (doesn’t erase data).
The software update for the cvtemsd338512m Smart TV includes the following changes:
(carefully) and look for a sticker on the main board. Example: CVTE MSD3385S-M 1A5 or CVTE 5800-xxx .
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Update automatically. ... If the Software Update option is grayed out, it is because a streaming app is running in the background. samsung.com How to update software and firmware on Samsung Smart TV
The indicator light is red, but the TV won't power on.