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Well i guess nobody has an idea. I will explain a little if someone like me tries to do this upgrade.
After you remove the hu_entry unit you install your hu_entrynav. You can find installation videos on youtube. It is fairly easy and takes 15 mins tops.
About the coding: you need to do some FA code with esys.
You should delete 6VB, change 6NH to 6NS (or add if you dont have it already) and code your FA (FA coding has endless documents here on other sections of the forum so please read and learn) .
Most probably coding HU_Entrynav will be blocked at this step and not available for coding. You should select "detect" and read CAFD so that you can do the coding.
After hu_entrynav starts working you can go ahead and upgrade your screen to 8.8" and do this 2 simple fdl codes:
HU_NBT > 3000 HMI > DISPLAY_SIZE_RESOLUTION = 8.8_1280x480
HU_NBT > 3001 EXBOX > DISPLAY_VARIANTE = breites_display
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