242-5122-410GY4
ATH2425131

The last two letters tell you what SW options are installed.
If the first letter is an A,B,C,G,J or K it has P25 Conv
The other letters it is mixed.

242-5126-460-GM3 or CM3
I don't have a CM options designator either.
This is a Series 3 which means it has the Motorola UCM module.
This is the only radio that can legally do DES-XL.
My guess is that this radio is/was military surplus and that it will have DES-XL and possibly AES.
It could have OTAR and FPP but I cannot guarantee that.
It will most likely have Digital Conv for sure.
Cannot guarantee any of the trunking options but going off the GM code and designators near that it 
COULD have SN/SZ(both ANA and DIG) and P25Trunking.

GM 
should be 
P25 Conventional
P25 Trunking
SN/SZ (Omini link) Trunking
Digital SN/SZ
Single key DES-OFB
512 Talk Groups/Channels
Hardware System Key Only

BF4
Conv Analog/Digital
SmartNet and SmartZone with Digital
Omnilink
DES-OFB
Conv OTAR
Trunking OTAR
512 TG

242-5379-201ABAB4

Boots up as ver 4.14.5

Thanks!



242-5

3 - 5300 series
7 - 7/800 Mhz
9 - Std. Power/Dash Mount
-
2 - P25 Conventional Analog/Digital
0 - No Encryption
1 - 6 Button Std. control head
a - Std. Cable, No Installed Options
b - P25 and SN/SZ Trunking Analog/Digital
a - No Data (not a data radio)
b - Default - Non OTAR
4 - This Must Be A Mobile Version #




Need to make sure you have the expanded memory radio. The early ones didn't ship with them.
To know for sure you can use PCC and do a read version info and look for the EEPROM number.
1.0 = low memory (512 is max)
2.0 - Expanded memory

Version 1 radios will do DES, DES-OFB (P25) & AES, but it's "Software encryption", and not FIPS-approved.
Version 2 uses the EFJ SEM module and will do DES, DES-OFB and AES (if the option is enabled),
Version 3 uses a Motorola UCM - which adds DES-XL (Motorola proprietary, which is why they went that way)
Version 4 has an EFJ SEM, which will do DES, DES-OFB and AES. Versions 2,3 and 4 are FIPS-approved.

IN all versions, the option has to be checked for the mode to work,
though as many have discovered, PCEdit will allow "checking" any & all options.
But checking the DES-XL box only actually works if the radio is a version 3 with DES-XL capability.

DES-XL requires v3 radio (mobile or portable) identified by the v3.xx.xx firmware
additionally by model num 242-5xxx-xx[x]3 - note the number 3 as the last character/digit.
                              5122-40 1 4

Version 1 2 and 3 are essentially the exact same units. The only difference is the encryption module.
Version 1 used a software based encryption (not FIPS certified).
Version 2 used a FIPS certified SEM chip
Version 3 used the motorola UCM module (to support DES-XL)
All 3 of these version used the Motorola SABER RF deck in them.
Version 4 is where EFJ started using a different RF deck supplier.
Although the RF specs on the version 4 (aka X platform) are better,
the radio in and of itself is not necessarily (in my opinion) an overall better design.
There were a lot more software improvement on the X verses the previous version
so you will see more flexibility there in what/how you can program the radio.






PCC 2.10.2 was the last released for the x platform. firmware 4.14.5 was the last firmware as well.

model 3 VHF 5100ES. Works far better than my 2500 ever did, and with the AMBE+2 vocoder,
has awesome digital transmit and receive. Motorola didn't start using AMBE+2 until their most recent APX series


The mod alpha posted allows for the most of the legacy input side, for the "legacy"
bandplan outputs here is the code to change to enable programming of the repeater outputs:
0CA778: 9A 99 99 99 19 38 8D 40 (935.0125) -> (918.0125) 9A 99 99 99 19 B0 8C 40
and in case you need to stretch the input range:
0CA770: 66 66 66 66 E6 27 8C 40 (900.9875) -> (913.9875) 66 66 66 66 E6 8F 8C 40