ACOM 500S firmware

Firmware history

All versions below were published by ACOM on acom-bg.com. Third-party and modified firmware is never listed.

1. Version 1.7 Latest Released Jul 16, 2025 First seen Sep 7, 2026

   ATU tuning now works with listen-only CAT, improved error handling, mic level fixes — summary by updatemystuff.com

   Source: acom-bg.com

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   • Improve stability d​uring CAT-controlled ATU tune
   • Make the ATU Tune process work with listen-only CAT
   • Fix ATU tune with unidirectional (listen-only) CAT
   • Retry CAT commands only when the radio does not respond
   • Try not to switch to manual tune mode when CAT error detected
   • Do not hardcode 100 mic level​ maximum for TS-990 and similar
   • Properly save the radio mic gain before tuning
   • Always report band number in telemetry messages
   Release notes & download
2. Version 1.3 Released Mar 20, 2024 First seen Sep 13, 2026

   Source: acom-bg.com

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   • Only interna​l code changes These changes are purely internal and have no eff​ect on end-user experience
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3. Version 1.2 Released Feb 19, 2024 First seen Sep 13, 2026

   Introduces active automatic protection and improves CAT interface reliability. — summary by updatemystuff.com

   Source: acom-bg.com

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   • NEW function: "Active automatic protection"
   • CAT interface: properly set power before tune
   • Increase threshold for 5V ma​x
   • YAESU CAT interface: restore MIC gain after tune
   • Improve code readability and add HW divisi​on (These changes are purely internal and have no effect on end-user experience)
   • Disable Auto-Operate after Hard Fault Error
   • Fix: selection of polling time and byte spacing
   Release notes & download
4. Version 1.0 Released Feb 24, 2023 First seen Sep 13, 2026

   Source: acom-bg.com

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   Base firmware version;

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