Questions about firmware reverse

[Wi1L-Y]

Sorry to bother you again!

Hi, maybe It is not appropriate to raise the question here.
These days I try to do more research on ble controller and I come into some problems. I have an Raspberry 4B now, I want to get its firmware and try to analysis it by static.
I try to use internalblue to get the firmware. But it stuck when using command "dumpmem", this problem I will try to solve it(or do you have some ideas?). The main problem is which program should be used to analysis the firmware( ida? )?

Or do there any other methods to get the firmware. It it a hard question for me because nobody around me do research on it .Hope to get the answer or some hints.

Best,
W