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The paper and links you've found make it very clear that the .DAT files are specifically for Mediatek GPSes.
is this file for Mediatek? https://api.smawatch.cn/epo/202201/m2_epo_offline_2022-01-11_847f4858827d0765e0402b8d7158c0aa.DAT
I just tried the three messages you listed myself and got ACK-ACK for all of them.
That is good! May be I just need to restart the watch to defragment RAM.
The paper and links you've found make it very clear that the .DAT files are specifically for Mediatek GPSes. Since we don't use one of those there's no point chasing that red herring.
I just tried the three messages you listed myself and got ACK-ACK for all of them.