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: A PC and an RS-232 serial cable (or a USB-to-RS-232 adapter if your PC lacks a 9-pin serial port).
Based on the phrase , the feature being described is typically related to Set-Top Box (STB) Firmware Maintenance and Recovery .
If Ver 40.2 complains that system partition is too large for your NAND:
If you have done all this and your STB is still dead, the NAND chip itself has likely failed. In that case, no software tool will work – you need hardware eMMC replacement.