Let’s break down the probable meaning of each part:

1. r29

• Likely meaning: Revision 29 of a firmware branch.
• In cellular module firmware (e.g., Quectel’s RG500Q, RM500Q series), firmware versions often follow patterns like RG500QEAAR11A01M4G — where R11 would be revision 11. R29 would be a later revision, potentially containing bug fixes, new features, or 5G SA/NSA improvements.

3. V12 Stability vs. V14

It is worth noting that while V12 is the most stable release for general use, there is a leaked V14 build floating around. However, I would advise sticking to V12 for now. V14 introduces new beamforming algorithms that seem to cause massive latency spikes (200ms+) on certain eNodeBs.

V12 is the "sweet spot" for users looking for reliability over experimental throughput speeds.

10. Downgrading from V12 to V10

Possible? – Yes, but requires bootloader unlock.

1. Obtain V10 firmware (R29_5G_LP3_V10.bin)
2. Enable telnet → run fw_setenv bootcmd "run bootcmd_nand"
3. Reboot to U-Boot (interrupt with Ctrl+C over serial)
4. Use nand erase and tftp to load V10
5. Re-lock bootloader if needed (not recommended)

Downgrading may cause modem firmware mismatch – only do if V12 introduces severe regressions.