Phil M0OFX<p>Well then. I think I might have found the MPT1343/MPT1327 Checkbits calculation function - used to figure out if the ESN on an MPT trunked radio has been illicitly modified.<br>The Motorola radio Labkit software (ESN Tool) that's been floating around for a while contains the algorithm.. it's in the function at address 0x401070.<br><a href="https://digipres.club/tags/hamradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hamradio</span></a> <a href="https://digipres.club/tags/MPT1327" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MPT1327</span></a> <a href="https://digipres.club/tags/trunkedradio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>trunkedradio</span></a></p>