This is for M10
$ ./m10_freq.py writebin --input m10_trimble_404MHz.hex --out test.hex --frequency 427850
Check the patch :
$ diff m10_trimble_404MHz.hex test.hex
2c2
< :1010100001A00C00FFFFFFFFFFFFFFFFFFFFFFFF2F
---
> :10101000CD5E0D00FFFFFFFFFFFFFFFFFFFFFFFFA4
$ ./m10_freq.py readbin --input m10_trimble_404MHz_Id1.hex
Reading the frequency value for M10...
Frequency read : 404.0