firmware update for 246T with-OUT a ac adapter

[scanningcentrecounty]

I am just getting around to updating my firmware to 2.60 from 2.05. but my ac adapter died a few years ago and I have been using 2 sets of rechargable to power it, Is there a way to do the update without one? I just got a 396xt and getting ready to sell the 246t and I really don't want to buy a new one if I don't need to, thanks

 

[UPMan]

Make sure the batteries are fully charged and there should not be an issue. Burning the EEPROM takes more power than typical, so weak cells could have a voltage drop that could result in a bad/incomplete write. Having AC power supplied is recommended, but you can still proceed w/o it.