What kind of question even is this? Type-A, of course. There's 'thumb drives' that will fit nicely. They're easier, cheaper to replace than solder-on eMMC when the flash finally wears out. This is all the more important now that GL.iNet has decided to drop microSD/TF card support on all current devices.
No USB modem is going to come close to USB 3's 5 Gbps max. through-output, anyway so USB-C 10 Gbps is a pointless premise given the real-world 2.3 Gbps Ethernet limit.
Then get a Slate Plus. There's no radios in a Brume.
How about you populate the UART headers & assign it a port, instead? 115200 bps serial is more important for hardware hackers than some esoteric, unsupported 'dongle.'
Here's the problems with the Burme v3 & it's not even on the drawing board:
- Cortex A53, not A76
- 1GB where 2GB or 4GB is expected if not 8GB while 16GB is on the horizon
- 2.5 GbE when 5 GbE & 10 GbE is now mainstream while 40 GbE is falling in price every day
GL.iNet's primary wired devices for stationary use are poor comparisons, half-hearted imitations compared to FriendlyElec's year old offerings like their R6S. Only the GUI is 'better' but I personally don't dislike LuCI.
My 2017 launched Certa is more up to date than my Slate AX... yet my Certa is EOL'd. Real innovators can't use GL.iNet's SKUs with their stale kernels or let themselves be shackled to proprietary SDKs, Bruce. Pass that along to your PM(s), please.
root@certa:~# cat /etc/glversion && cat /etc/os-release | grep 'PRETTY_NAME' && uname -a
4.3.25
PRETTY_NAME="OpenWrt 22.03.4"
Linux certa 5.10.176 #0 Sun Apr 9 12:27:46 2023 mips GNU/Linux
root@slate-ax:~# cat /etc/glversion && cat /etc/os-release | grep 'PRETTY_NAME' && uname -a
4.8.0
PRETTY_NAME="OpenWrt 23.05-SNAPSHOT"
Linux slate-ax 5.4.164 #0 SMP PREEMPT Thu Jul 24 01:15:41 2025 aarch64 GNU/Linux