I did everything you said and my xxl now works with navcore 9.51 as before.
When i began,after the procedure you showed me, to use F/A and update meta txt it appeared that tt go bif or tt go navigation is missing. Then I copied and pasted from my backup files an archive with the name ttgo.iso(bif) and now everything works fine.
Flashing Red X dissapeared.
Also I put the file with the voices and everything is ok.
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