This sounds like the DSP firmware has got corrupted in IC9004 and maybe IC9704 as well. This may have been caused by a failed or failing DSP chip or just a glitch when the update was taking place.
The only way I am aware of to fix this is to remove the two flash memory chips from a working model that uses the same chips, LX59/79/89 and copy them to the ones in yours.
The way I fixed my LX86 probably won't work as your 1st DSP is a Cirrus Logic and the 2nd is a Texas Instruments. The LX86 uses two identical TI devices so the first part of the code that gets corrupted is the same.
You have two problems... finding a working LX59/79/89 and then persuading the owner to let you remove the DSP memory chips to copy them.
Heating the DSP chip in this model is unlikely to help. It is the later 'D' variant and shouldn't suffer premature failure. It's also unlikely to have solder joint problems as it's not a BGA device like the earlier models had. Reloading the firmware from USB won't fix this in my experience once the DSP memory is corrupted.
This is difficult for me to answer because I've not worked on this model. It has DSP chips from two manufacturers.
Before changing the processors, power the receiver up for 5 minutes and see if both chips are warm to touch. If not, check the voltage regulators that supply power to them. It may just be a small regulator failed.
If you decide to remove the DSP chips, use a new scalpel blade to gently score the chip legs close to the chip body. Only use light pressure until the blade breaks through each leg which will take 4 or 5 goes each side.
Take your time so not to break through to the circuit board tracks below. Once all four sides are cut, put liquid flux around all pins and run a fine tip iron along to take them all off.
All that leaves is the chip body held by the ground pad underneath. Use a heat gun and concentrate the heat in the middle of the chip for about 90 seconds to free it.
The new chip will need solder paste put under to connect the pad and I heat that after soldering all the outer legs.
A dremel will do the job much quicker but I wouldn't want to slip with it as it will also do a lot of damage to the tiny components around the chip if you do.
I would make sure the power to both DSP chips is present and the correct voltage first. Then I would try to get a good copy of the DSP firmware from a working receiver. The small flash memory chips are easy to remove, erase and rewrite if you have access to a EEPROM programmer.
I found the UE22 error goes away once the flash memory gets corrupted from a failed USB update. Correcting the flash memory will either get it working or restore the flashing UE22. If that happens then it's time to change the DSP chips.
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