Many thanks for this script, everything ok 👍(provided you have binutils installed, which was not the case on my minimal image). I am still struggling to get wifi working on my V1.1 board with the generated rk3528-x88pro.dtb ( works well with hinlink-ht2.dtb)
I finally managed to boot in Maskrom mode by shorting the clock pin (red circle on the picture) to ground, then loading the loader (rk3528_spl_loader_v1.07.104.bin) and u-boot with rkdeveloptool.