Some simple installation questions

[blas]

According to here you should only connect the RTC battery and it will work normally.

Real Time Clock (RTC)

It’s listed here: https://shop.allnetchina.cn/collections/rock-pi-4-accessories/products/rtc-battery-for-rock-pi-4 RTC should work out of box. Just plugin the battery.

About the external antenna you can check how to do it here:

New PCB Version? 1.3 ->1.4

Yes, by default the antenna is routed to on board antenna, but we can also solder an U.FL connector and change the orientation of C3/C4(sharing one pad) to U.FL connector. [wifi_ant] Check page 22 of the sch: https://dl.radxa.com/rockpi4/docs/hw/rockpi4/rockpi4_v13_sch_20181112.pdf [ant_sch]