What software can decimate UBX/Rinex?

G’day All

I have a couple of Spectra Precision (PM500) receivers that Trimble will no longer support. After the last Glonass calendar debacle, we received a firmware update that did not correct for the GPS week correction. To enable me to use these receivers with the RS2’s, I need to fix the timestamp on the Rinex files before post processing . I have perused the TECQ manuals, but I’m afraid that the meriad of options baffled me.
Is there a program or procedure to fix this issue, other than through TECQ?
Many thanks.

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