Hi,
as a beginner in nrf world I plan to design a mini devkit with 9161. I plan SW pins connector for it to program/debug via Segger j-link and additional UART-USB interface with 2102 to enable USB monitoring/configuring.
However, in "nRF9160 Hardware Design Guidelines", page 27, I am observing the following note:
"If you want to perform full modem firmware upgrade, an external flash memory with a minimum of 4MB free space is required".
Question 1: Does it mean that the planned devkit design must incorporate the external flash memory to upgrade the modem firmware?
Additionally, I am currently playing with the original nrf9161dk (and guided to ..._ns builds with tf-m). What puzzles me is the modem firmware version vs application compatibility. The "Quick start" in nrf connect flashes 2.0.1 firmware version which seems to work with samples and early versions of my planned app, however, I observe higher versions of modem firmware availability in Downloads section and I am not sure whether I should flash it to nrf9161dk and later to my future planned devkit.
Question 2: Could you kindly give me some hints / links to understand the modem firmware version logic?
Thank you very much!
