A2 bootloader stuck on booting from Flash

We applied the instructions to program QSPI Flash (32MB serial NOR Flash memory, Pmod SF3) and then verified that Flash has been programmed (we used flash_peek command in CLI test to read a set of addresses in Flash memory). However, A2 Bootloader does not complete the load operation and seems to have stuck:

Jan 28 2022 14:42:41
A2 Bootloader Bootsel=1 rr=00
Loading Section 00000000 to ffff080

There could be many reasons causing this but I suspect that I use a wrong version of the A2 bootloader. Does the code in main branch correspond to stable version?