Another option that I thought of to keep the data persistent across R1CBU firmware upgrades would be store it somewhere in the internal MMC device instead of the SD card.
I wrote the attached S01mount_data script which can be used in lieu of S01create_data, and the data will be stored in the radio itself.
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Of course one of the issues with this approach is that if the X6100 dies and needs to be replaced, that data is gone too; also backing up this data is doable but it is a little trickier.
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Franco
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