NOTE: Please note that everything provided here is as is. I didn't test or read extensively that material. Discretion is advised.
All those files were found on the internet, don't exactly remember the sources.
| Firmware Version | Model | Firmware Level | File | Source |
|---|---|---|---|---|
| P372C | Unspecified | -6 (Version 6) | p371c.zip | Don't remember |
| P371D | Unspecified | -6 (Version 6) | p371d.zip | Don't remember |
| P401A | Unspecified | -1 (Version 1) | p401a.zip | Don't remember, not a dump from mine |
### KX-TD1232
| Firmware Version | Model | Firmware Level | File | Source |
|---|---|---|---|---|
| P221B | Unspecified | -1 (Version 1) | p221b.zip | Don't remember |
| P221B12 (P221M?) | BX? | -1 (Version 1)¹ | p221b12.zip | Don't remember |
| P231C[70905A](1997) | Unspecified | -2 (Version 2)² | p231c.zip | Don't remember |
| P231C | Unspecified | -2 (Version 2)² | p231c_olddos.zip | Old-DOS.ru |
| P271A | Unspecified | ?³ | p271a.zip | Don't remember |
| P271C | Unspecified | ?³ | p271c.zip | Don't remember |
| P271D | B? | ?³ | p271d.zip | Don't remember |
| P271F | Unspecified | ?³ | p271f.zip | Don't remember |
| P271H | Unspecified | ?³ | p271h.zip | Don't remember |
| P271I | Unspecified | ?³ | p271i.zip | Don't remember |
1: According to this thread, B12M is described as «with P222B12M special downgrade version for 12MHz CPU, for tandem configuration only» (Firefox translation.)
2: From the same thread, we learn P231B is «the latest version for some old motherboards with 256K RAM», which seems to suggest that release requires 1 MB RAM installed.
3: I wasn't able to find any information for P271x releases, thus far… One would assume they're newer, but the aforementioned thread shows P211x from -4 onwards, so I can't tell for sure.