Insert the stock SD card into your PC. Use Win32DiskImager to create a full backup. You likely won’t need it, but it’s safe practice.
If your device is a (often sold on AliExpress, Amazon, etc. under generic names), it is typically a low-cost Rockchip RK3126 or Actions ATJ2279B based console. These devices often run a closed, proprietary firmware and are not supported by mainstream custom firmware communities. sup m3 custom firmware high quality
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But since you asked for , I’ll focus on the M33 CFW experience and how to achieve it cleanly. etc. under generic names)