Is an EFJ 5100 version 1.18.15 upgradable to 4.xx.xx, or anything else newer? If the answer is "no", then I need a version of PC Tune that will work with v1.18.15. My version of PC Tune is 3.0.14, and it will not work with 1.18.15 radios.
Unfortunately it cannot be flashed to 4.x firmware. The highest it could go is 1.20.11 (Needs PCC 1.30.7 and PCTune 2.2.3 after the upgrade) . I show PCTune 22.214.171.124 as being the official version along with PCC 126.96.36.199. Unfortunately I do not have a copy of that version of PCTune. If another member does, i don't see that it would be an issue to have it posted.