When Toyota Lexus 2018-2021 Smart Key AKL (including Toyota RAV4 2019- 2020, new Highlander, Avalon; Lexus ES, UX, LS, GX series. etc), the best solution is to use Lonsdor K518ISE / KH100+ key programmer + Lonsdor dedicated smart key Toyota FT111 H0440c + Toyota yearly AKL license subscription. No need NASTF code for 24-48 hours use and $60-$100 subscription.  No need new OEM key for $150.

Use Lonsdor K518ISE for 2020 Toyota RAV4 Prox All Keys Lost Programming via OBD

Good to know: the procedure is as the same as that of Key Programmer KH100+.

Prepare:

In vehicle make sure you have a strong wifi signal available either a hotspot to something nearby

Also make sure you have authorization installed.

Procedure:

Firstly, disassemble the lonsdor h0440c key

Remove emergency key first
Remove pcb board to begin programming
If you got the pcb separately, ignore this step.
Use backside for best signal and reception

Set wifi setting
Connect to strong wifi
Enter Lonsdor K518ISE main menu, choose Special Functions-Key settings-FT smart key-8A-Generate smart key.

Please make sure stable network connection.

Put smart key into the card slot by following the on-screen instruction.

Choose frequency 314.35 and it will download the information from the car.

Note: Frequency may vary, USA frequencies range bettwen 312 and 315.

Take all keys outside the vehicle, press START button, put H0440C key close to the button to begin vehicle data transfer to PCB. wait for about 10s until indicator pulses regular for 10 seconds straight, if the key indicator does not flash, press Start button once again

Note:

At this point, if the Lonsdor K518ISE failed to proceed choose another frequency and repeat the previous process.

Return pcb to coil and continue
Lonsdor k518 is downloading that information from the card

Choose don’t have working key.

Generate key successfully

Next step: Remote Modification

If car starts, but remote donesn’t work >Continue to the next step<

If everything works, it’s not needed, you are done.
Now the key can start car, but remote does not work, go ahead to the next step.

Return to Special functions-Key settings-FT smart key-8A-Modify remote count value

This function is only useful if you’ve already generated a key that doesn’t fully function for the vehicle.

Put the smart key generated online into the card slot.

Edit value
Add 400 to the value shown and then modify
The value should be 1406

It’s been modified.
Test the key, still not function, it is normal.
We will do the modification again

Modifying made simple
The numbers in sequence range from 1-F
When adding increments of 400 keep in min 4+4=8, but 8+4=C
[0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F]

Here is the number sequence without the testing and retries involved.1006 >1406 > 1806 > 1C06 > 2006 >2406 >2806 >2C06 > 3006 > 3406 > 3806. to clarify, the last 2 numbers are just to be copied as presented. the Lonsdor k518 machine automatically adjusts them each time it’s read, and the end result is unpredictable. just think of the numbers as [0000]- 10 – (XX), where the x’s are just to be copied and just follow the rest of the sequence follows the above pattern adding “0400” each time.

Edit value agin, this time, modify value 3845

Edit success

Remote is working.
Earthing is working.
Once vehicle responds to remote, you have found the correct modification value.
Be sure to test all button and proximity functions before finishing.

Job is done.