This release patches various issues discovered since the 2.0.8 release and also includes some useful enhancements.

New Features

• M154 S Position Auto-Report (#18427)
• Laser Cutter Air Assist (#21753)
• ExtUI event for PID tuning start (#21734)
• Echo LCD message to serial in kill
• UBL Mesh Wizard (#21556, #21791)
• Support a third serial port (#21784)
• Instant Freeze/Resume Function (#17462)

New Machines and Boards

• BigTreeTech SKR V2 Rev B (#21805)
• BigTreeTech Octopus (STM32F446ZET6) (#21826, #21882, #21883, #21901)

Optimized / Improved

• Debounce for Power-Loss pin
• Optimize G-code flag parameters (#21849)
• Move temp errors calling kill() out of ISR (#21832)

Configuration

• Allow disable of POWER_TIMEOUT (#21771)
• Allow Creality V4 SERVO0 and PROBE pin overrides (#21770)
• SOFT_RESET_VIA_SERIAL sanity-check
• Better error message for bad array sizes
• Fix G29_RETRY_AND_RECOVER dependency (#21907)
• 🔧 Improve SD_DETECT_STATE default (#21885)
• Update Advanced Pause description (#21829)
• Fix multi volume config typo (#21880)
• Make [XYZ]_ENABLE_PIN an optional pin (#21801)

LCD / Controller

• Capacitive Touch Screen (GT911) for SKR SE BX (#21843)
• Add MKS_LCD12864B
• Fix E3V2 Control Menu icon/text order (#21838)
• Fix MKS UI missing font select condition (#21905)
• Fix Nextion compile error (#21884)
• Active MMU slot indicator (#21842)
• TFT pins for BTT GTR V1
• TFT SPI for BTT SKR v1.3 (#21794)
• Update SKR 1.3 touch pins
• Update Robin Pro TFT Pins (#21879, #21900)

Build and Upload

• BigTreeTech SKR Mini E3 with HAL/STM32 (#21488)
• Only look for target disk during Upload (#21804)
• Update STM32 platform to 12.1
• Use adafruit/Adafruit NeoPixel@~1.8.0
• Update FLSUN_HISPEED env to flsun_hispeedv1 (#21510)

For Developers

• Move ExtUI subfolders up a level (#21820)
• Add and apply REPEAT_1 macro
• Apply SBI/CBI/TEST in HAL
• Additional utility macros
• Simplify macro expansion with recursion (#21859)
• Better opt_set comment of old val
• Simplify / undef extra endstops (#21808)

General Issues Fixed

• Fix "undefined abl_points" error
• Fix SDCARD_CONNECTION default for BTT SKR (#21755)
• Fix Singlenozzle Standby issues (#21759)
• Fix Power-Loss Save on Pause (#21749)
• Fix Z raise in filament load M701 (#21762)
• Add missing ExtUI method (#21763)
• Fix parser temperature rounding
• Fix bad call to 'diskIODriver' (#21775)
• Fix bad DELTA probe move (#21781)
• Fix flush_and_request_resend
• Prevent watchdog reset in setup() (#21776)
• Pause and PLR refinements
• Fix MMU2 compile with include (#21809)
• Update Chart.js to 2.9.4 for e4d@box UI
• 📝 Fix version reference
• 🐛 Fix excessive MMU2 timeout (#21855)
• G60-G61 Save E position (#21810)
• Patches for CASE_LIGHT_USE_RGB_LED (#21811)
• Let M421 C select any point
• Always prompt in M125 if host-prompt (as with Ext UI) (#21828)
• Lerdge K EEPROM and TFT (#21812)
• Consider SD print complete only when commands are done (#21840)
• 🐛 Fix Lerdge USB Flash Drive envs (#21847)
• Unify BTT Motor Expansion Options (#21823)
• Fix and improve Power-Loss Recovery (#21779, #21894)
• Fix L64xx init for Z4 axis
• 🐛 Fix G5 IJ with Motion Mode (#21858)
• Fix compilation failure in M1001 (#21897)
• 🐛 Fix Realtime Reporting with Motion Modes (#21902)