Hello, @wael_b
Thanks for your clarification.
1. AN13750 is originally released several years ago, which is targeted with S32G2 and specified software packages version.
2. With the specified software version and RDB2, it could be also be regarded as a hands-on guide, however, for S32G3(RDB3 for example), it may not be directly followed since the SW/HW differences. But the operation method/booting steps are the same for S32G3, you may need reference the AN13750 and made some changes to make it compatible to the S32G3 related software packages used.
3. From my experience, I suggest directly referencing the ways/steps provided by AN13750 on your S32G3 case, and try using the following software packages: the Bootloader from GoldVIP1.12, with SW32G_RTD_4.4_4.0.2_HF03, IPCF4.10, BSP41/42 to have another try.
BR
Chenyin