How do you want the part to be programmed?, BSL or SBW? For BSL, I ended up making a small handheld dongle using silabs CP2110 and C# custom loader. As you don't know if part is erased and being reprogramed, I do both passwords as once you are in there is no harm sending wrong password if you set clear-all to a zero in your firmware. So first I send all 0xff and then I send the ISR-table, the table is the same for all reversions as I made a rejump table.
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