The "1.3.5" designation typically points to a build based on that has been backported and tuned specifically for the Chiron’s Trigorilla motherboard. This specific build became famous because it fixed three major stock firmware flaws:
The most reliable sources as of 2025-2026 are: anycubic chiron firmware 135 download repack
If you truly need a modified version of v1.3.5 (or newer Marlin for Chiron): The "1
: Check the Anycubic Firmware & Software page for the latest updates, though version 1.3.0 is more common there. anycubic chiron firmware 135 download repack
In , navigate to Settings > Printer > Manage Printers . Select the Chiron and click Update Firmware .