If the faceplate or a ticket says “955,” it is an SR-955HPC family radio. There is no separate “955 HP” model. People sometimes say HP; they mean HPC. See What is the difference between a SR-955hpc and a SR-955hp?
What does change is the generation: classic Version 1, Version 2, or HPC+ (often called “V3”). Use the matching programming software. Mixing them is what causes Read failures and Overflow errors.
The three 955 generations
| What you have | How to spot it | Programming software | Runtime Error 6 (Overflow) |
|---|---|---|---|
| Classic / Version 1 | Full-size chassis, no vents in the case. Also called original 955 or V1. | SR-955HPC Software 1.00 | Does not have this issue. Do not use the Overflow zip files. |
| Version 2 | Full-size chassis with vents on the case. | SR-955HPC Software Version 2 | Can appear on Read from Radio. Use Overflow (V2 and HPC+ only). |
| HPC+ | Short chassis with vents in the case. Also called 955 Plus or V3. | SR-955HPC+ Software | Can appear on Read from Radio. Same Overflow article. “V3 software” means this file — Where do I find V3 programming software? |
Quick check: no vents = V1. Full size with vents = V2. Short case with vents = HPC+.
If you still are not sure
Box, receipt, or dealer listing that says HPC+, Plus, or V2 is useful. Software that already Reads on that radio: 1.00 = V1, Version 2 installer = V2, HPC+ installer = Plus. If a file will not Read, you likely picked the wrong generation — do not Write.
Send support a photo of the case side (so vents and length show) and the serial number. Do not load an HPC+ or V2 .Dat file into a Version 1.
Same case versions on the 655: Which 655 do I have?
Not the same as a 655
The SR-655HPC looks similar and shares the USB cable. The 955 has SSB and covers 10 and 12 meters; the 655 does not. Difference between the SR-655HPC and SR-955HPC.
Program it next
Programming the SR-955HPC — pick your model and Windows version (software file + Windows driver on one page).
Downloads list: strykerradios.com/software-dowloads-10-meter-radio.
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