For removing reverse camera guidelines shift into reverse. On the screen you should see something like a green arrow on the right side. If not, tap on screen and it should appear. Then tap on the green arrow and you should see 5 options in circles. 2 of them are for the guidelines.
Source: https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-87847637
For older firmwares (released at least before 12/2022) see here:
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-87066797
NOTE: For those without calibration cloth, this member used trash bags 😀:
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-88658357
To calibrate 360 cameras with Roundadas app you need to go to Engineering Mode and enter PIN 4321.
Go to debug cloth
Select debug cloth pattern and place it on the ground around your car - see Calibration/Debug cloth section
Go to Adjustment angle and change the physicals position of cameras if you can not see your cloth pattern correctly
Go to Execute debug
Select the type of lens used in the camera (I have no idea how to check it)
Measure the required dimensions and enter them
Click on Auto calibration
If it fails or you are not satisfied with the results, then do Manual calibration:
Forced photography -> Yes
Click on the magnifier on the 1st point
Adjust the position with arrows and click OK
Go through all 8 points - Don't skip any of the points even though you don't adjust it. Don't go back to the previous point. Always start from the 1st point. Otherwise it fails to submit and you have to repeat everything.
Repeat the procedure for each camera
Click the Submission
The calibration parameters should be displayed
Connect USB stick and export your final calibration by clicking Derived parameter to back it up - saves two files camData.pcr, pam.pcr in roundadas folder. The head unit update doesn't remove the parameters, but it's good to have a backup.
To calibrate automatically 360 cameras you need to buy special debug cloth. Instead of spending extra money on it, you can draw lines on the ground, or place any objects at key edges of the debug cloth pattern, so that you can point those points on the screen during the manual calibration. Moreover, in my case, I needed to do manual calibrate my camera as the automatic calibration was really bad.
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-86393289
Browse between all pictures:
This member provided a solution. No idea how it works
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-89750841