I bought some handsets but they were registered to another base. How do I deregister without the base

SOURCE: DeRegistering a Damaged Cordless Phone????!!!!

If you are still looking for an answer on dereg of a handset, the manual says Menu - 0-0-2 then 3-3-5-OK then select the handset you want to cancel/deregister

SOURCE: how to deregister a handset without the base with which it orginally registered

I successfully reset uniden TCX800 handset by reconnecting the battery while holding the '*' and '#' key, then press the right upper soft key near LCD.

SOURCE: DeRegistering a Damaged Cordless Phone???!!!!

Here is the procedure as given to me by Panasonic Tech Support.

To DEREGISTER, using the handset you want to register, push MENU.....002.......335...and hit ok.
Then press the handset number you want to deregister (1 through 4). Don't worry if the handset says there is no link to base. This is because you just unregistered it so there will be no link.

To REGISTER, press and hold the locator button on the base unit until the green LED starts blinking. Then take the handset unit and press MENU.......001 and hit ok. Your unit should now be registered.

Good luck!

SOURCE: nEED TO DEREGISTER LOST HANDSET

I had this problem too. Hold "End" and "#"at the same time fora few seconds and it will deregister. Then just put it on the new base.

SOURCE: Reset base unit of Uniden TRU9485

Uniden TRU9485 (This didn’t work for me but this was the first instruction from Uniden Tech Support)

TO RESET THE BASE UNIT:
Unplug the base unit AC adapter.
Hold down for 15 seconds the DND, * and “menu” soft key (the middle silver soft key under the LCD) while plugging the base unit AC adapter back in.
All the settings should be reset.

Uniden TRU9485 (Worked for me)
ALTERNATE WAY TO RESET THE BASE UNIT:

Unplug the base unit AC adapter.
Hold down for 15 seconds the DELETE KEY (zero with a line through it) while plugging base unit AC adapter back in.
All the settings should be reset.