Motorola Flashzap [best]

Reserved for deep maintenance, troubleshooting severe firmware errors, or when a radio is non-functional. How to Put a Motorola Radio into FlashZap Mode

FlashZap (sometimes referred to as FlashPort or Bootloading mode) is a specialized low-level recovery and firmware update mode for Motorola professional two-way radios, such as the ASTRO 25 (XTS/XTL) and MOTOTRBO series motorola flashzap

Embedded in the hardware ROM, verifies the digital signature of the next stage. Reserved for deep maintenance

If the radio cannot be restored via FlashZap, it may require repair by a qualified Motorola service technician. FlashZap vs. Radio Management (RM) & CPS troubleshooting severe firmware errors