The most trusted repack is by (GitHub), based on Marlin 2.0.x but backported to work with the Chiron’s stock Trigorilla board and TFT. This repack retains the v1.3.5 appearance but fixes critical bugs.
(Manage Printers > Update Firmware) or a dedicated tool like Connection: anycubic chiron firmware 135 download repack
Use Ultimaker Cura (Manage Printers > Update Firmware > Upload Custom Firmware) and select the .hex file. : The most trusted repack is by (GitHub), based on Marlin 2
Choose and point to the downloaded .hex file. USB Method (via SD/USB) : anycubic chiron firmware 135 download repack
: After any flash, it is highly recommended to send M502 followed by M500 via a terminal like Pronterface to reset and save default factory settings. Anycubic Chiron Firmware Update - How to Install!