The PMB6826 (BBPMU_RF) is the Intel baseband power management IC used on iPhone 7 and iPhone 7 Plus Intel-variant boards. This chip regulates power to the baseband section, and when it fails you usually see no service, dead after flash, or network issue symptoms that software alone won't fix. Technicians reaching for this IC are almost always dealing with a board-level baseband fault rather than a simple software glitch. Reflow, reball, or replace depending on your diagnosis — this part restores baseband power delivery so the modem section gets what it needs to register on the network again.
