Xda: Qxdm

Warning: This process requires Windows 10/11, a Qualcomm device with Unlocked Bootloader and Root, and a willingness to potentially void your warranty.

(Most famous & beginner-friendly)

Classic threads like "[GUIDE] Unlocking Hidden Bands with QXDM" defined this era. Developers like autoprime and djrbliss reverse-engineered how LG and HTC locked their radios. The XDA community discovered that using QXDM to write NV_6828 (RF NV Manager) could unlock GSM bands on CDMA-only phones. qxdm xda

Threads titled "Enable ALL LTE bands on Snapdragon X55/X60". These are legal gray areas. They explain how to use NV_44377 (RF Band Configuration) to force enable bands like B71 (T-Mobile) or B28 (Latin America) on Chinese import phones. Warning: This process requires Windows 10/11, a Qualcomm