Questions about SOC FPGA Preloader and device tree

Hello!

I have 2 questions:

how can I program the FPGA definitively given an RBF file? (I ve tried to write it to the QSPI flash at address 0x800000 , I ve sent the prelaoder, as well at adress 0x0, but nothing happened, the FPGA still configured same old,) (I followed the instruction here https://rocketboards.org/foswiki/documentation/gsrd131programmingfpga)

Why I lost control to my board when I program my FPGA via quartus programmer?

My board: Altera cyclone V SoC SX, with linux 3.7, ARM dual core A9

Thanks in advance

Sahbi