The “FK” portion of the name has no relation to the 7.5 FK pistol cartridge developed by FK Brno Engineering; it is simply an internal firmware naming convention used by Chinese manufacturers.
Updating firmware carries a minor risk of bricking the head unit if interrupted. Complete these preparatory steps first: v7.5bt-fk-tp update
This firmware is primarily designed to resolve system stability issues and expand smartphone integration for budget double-din head units. Primary Fixes The “FK” portion of the name has no relation to the 7
The "BT" in the firmware designation often points toward enhancements. In previous iterations, users frequently encountered "handshake" issues—moments where a smartphone and the car failed to recognize each other, or the connection dropped mid-call. The v7.5 update prioritizes a more aggressive reconnection protocol, ensuring that the moment the ignition turns, the digital handshake is instantaneous and secure. 2. The "FK" and "TP" Factors Primary Fixes The "BT" in the firmware designation