Butter knifes should work fine. I use the L shaped tools but the L part is just a way to pull tool back out. Just insert butter knives on each side halfway top to bottom. (Stab them straight in.) Push in on each knife about 2.5 to three inches and the radio will be free. Just releases a detent on each side. Mine only has the detents on each side. Had mine out way too many times. Not radio issues but wiring problems.
I have a 2016 Thor ACE 29.3 with an Axxera radio. I have had problems with the video feed from backup and side cameras for a long time. I am posting here three photos of the radio, a 3-port video switch, and the connector between the video switch and the radio.
This video switch WAS NOT SECURED under the dash by Thor. It was simply stuffed up in the dash between the driver and the radio. It was bouncing around and literally fell out of the dash.
Furthermore, the yellow-ended video connector cable was a piece of crap. It wiggled while driving and I would lose the video feed. Despite reaching up in there and re-seating the connectors several times it would not remain tight.
So finally today - I removed the radio from the dash and replaced the damn cable. The radio came out easily with the removal tool provided by Thor with my coach "black bag". Its only about a 24 inch cable. The new cable - which I had in the house - had a much tighter fit. I then taped the connections at two points. One at the video switch and one at the radio. I tested and then returned the radio to the dash. I found a spot under the dash to secure the video switch with Velcro and returned it and all the wires under the dash. I also tightened the screw connectors coming to the video switch from each of the three cameras.
I'm hoping this finally resolves the failing video feeds from my coach cameras.
Call your dealer and get your big Thor bag. It has all kinds of info about your water heater your refrigerator your gas your furnace you need that bag also look inside the closet door they have a sheet listing all the serial numbers to these items. Good luck get that bag.
The info in the bag is also available online, specific to your vin number.