Flash Revealer: SonoAlti_2V_Flash_Revealer.zip
Flash Eraser: Flash_Eraser_SAMD51.zip

Firmware Version 1.5 (1/4/21)
Tripled the battery life of the altimeter.
SonoAlti_2V_Firmware_1_5.zip

Firmware Version 1.4 (11/15/20)
Addressed issue of altimeter occasionally momentarily going into canopy mode during freefall when burbled.
SonoAlti_2V_Firmware_1_4.zip

Firmware Version 1.3 (11/11/20)
Extended the amount of time one can be in a holding pattern in an aircraft before the altimeter zeros.
SonoAlti_2V_Firmware_1_3.zip

Firmware Version 1.2 (11/9/20)
Fixed small bug related to occasionally getting stuck in ascent mode when traveling, thus saving battery.
SonoAlti_2V_Firmware_1_2.zip

Firmware Version 1.1 (9/1/20)
Original firmware.
SonoAlti_2V_Firmware_1_1.zip