Flash chip is EOL
The M25P32-VMF6P flash memory, in SOIC 16, on the conv-ttl-rs485 appears
to be EOL. A few stocks might still be available for urgent production,
but ideally it should be replaced.
If a similar footprint flash can be found it would be ideal.
Better still, a design that can take multiple flash chip footprints
might be required, and could be the most future-proof solution.