Baofeng Programming UV-5RTP with CHIRP

[KC3HYA]

Been looking for answers for a while for this but can't find a solution. The closest thread I found was this, but it seems like the OP got help outside the forum with a change to the .img file.

I have a UV-5RTP that I'm dusting off after not using it for a while. I'm trying to edit the frequencies programmed into it way back when, but CHIRP is telling me that frequencies in the 70cm band are out of range for this radio, which is incorrect. Here are the steps I follow:
In CHIRP, "Download from Radio" and select Baofeng BF-F8HP (UV-5RTP isn't in the list, and 5R doesn't have the three power levels like the F8HP model)
Success - I see all of the programmed frequencies
Select the frequency programmed in already, 446.000. Don't change it, press enter
Get a message saying Error setting memory: Frequency 446.000 is out of supported range

I've already checked in Settings > Other Settings. The radio is already set up to accept UHF frequencies from 200-999 MHz (I know the radio can't do this, but obviously 446 falls in this range).

I can upload the same image back to the radio without changing anything, and can modify the settings without issue (changed the UHF lower limit by 1 MHz to test that, and no issues). Just can't put in new UHF frequencies. Not sure what I'm missing here.

If it helps, the firmware says N5R3409 / BFP3-25. Any suggestions would be helpful. Thanks.

 

[KC3HYA]

Solved - for anyone that stumbles upon this in the future. I don't know why I did this years ago, but in CHIRP, I had adjusted my VHF and UHF upper and lower limits to be 100-199 and 200-999, respectively. Not sure why - I was probably messing around to see what, if anything, would be received on bands outside what it was designed for. (Spoiler: as expected, it doesn't work.) To fix my original issue, I reset these settings to the default 136-174 MHz and 400-520 MHz. After that, I was able to program the regular 70cm frequencies. Strange issue, since the frequencies I was trying to program were clearly between the limits I had set. If anyone has a good explanation on why this solved the issue, I'm all ears.

Working theory: With the 999 MHz number in there, I somehow overflowed the floating point precision where that number was stored in the radio's memory, which made it think the upper bound was lower than 999. That's just a guess. Interested to see if anyone with more experience think that theory holds any water.

One other note I'll add here is that I had to do it in 2 steps. I have two of these radios, and when I fixed the first one, I just unplugged it and plugged in the next one, then tried to upload that same image directly to the second radio. It failed - I forget the error message, but it wouldn't work until I first fixed the upper/lower limits, THEN uploaded my changes.

Glad I got it figured out. Hope this helps someone in the future.