Managed to find: N5R-2401 is this good enough? or should I try to get a higher number? like NR5R-3409?
N5R2401 is from a radio with 2 power levels (a UV-5R variant) N5R3409 is from a radio with 3 power levels (a BF-F8HP variant)
The BEEP bug was the last known user detectable bug a UV-5R variant. It was introduced with the N5R-20 firmware back in the summer of 2014 . It fixed in September of 2014.
As long as the radios have one of the N5R2xxx or N5R3xxx firmware versions, you aren't going to notice any difference between firmware versions.
Except for the fact that CHIRP is the only way a consumer can determine the "real" firmware version of these UV-5R and BF-F8HP variants, this discussion has nothing to do with CHIRP and should probably me moved to a Baofeng/UV-5R related forum.
Jim KC9HI