Before replacing your board, always verify the silkscreen in the bottom right corner. If it says "REV: 4.0" inside a white box, you have the definitive version of this embedded workhorse.

// Boot-time check uint8_t rev = (gpio_get_level(IO4) << 1) | gpio_get_level(IO5); switch(rev) case 0: // V1 - Fallback to safe mode case 1: // V2 - Disable RF high power case 2: // V3 - Enable workarounds case 3: // V4 - Full performance mode

Integrates the Qualcomm SDM439 (Snapdragon 439) as the central control unit .

Based on schematics for this board revision, the following subsystems are present:

C3e-mb-pcb-v4 -

Before replacing your board, always verify the silkscreen in the bottom right corner. If it says "REV: 4.0" inside a white box, you have the definitive version of this embedded workhorse.

// Boot-time check uint8_t rev = (gpio_get_level(IO4) << 1) | gpio_get_level(IO5); switch(rev) case 0: // V1 - Fallback to safe mode case 1: // V2 - Disable RF high power case 2: // V3 - Enable workarounds case 3: // V4 - Full performance mode c3e-mb-pcb-v4

Integrates the Qualcomm SDM439 (Snapdragon 439) as the central control unit . Before replacing your board, always verify the silkscreen

Based on schematics for this board revision, the following subsystems are present: Before replacing your board