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Rollback firmware flashing in case iinternal flash error (brick rollback in case bootblock region being WP) #1839

@tlaurion

Description

@tlaurion

flasrom/flashprog could fail internal flashing.

A simple protection against this would be to
1- backup the current rom in memory
2- do whatever we currently do in flash.sh || flash backup rom in case of error

Be safer against possible user errors with chip specific SPI WP support landing iteratively under flashrom/flashprog and user interest into WP.

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