[MTCD Android Head Units General] marchnz:
This thread is to document MCUs found to be cross-compatible between MTCD units, which includes PX3 and PX5 variants, which share identical mainboard hardware and MCU Chip STM32F091.

The following MTCD & MTCE (as of v2.56) MCUs have been validated as cross compatible on 1024x600 units:

- MLT - 01/07/17 - caution - has resulted in issues for some [MENTION=6472486]leonkernan[/MENTION]

- JY

- KBT - 08/12/2017 - thanks [MENTION=8603573]abagos[/MENTION]

- KD (v2.40_2 - enables bluetooth hands free in both front speakers)

- KGL

- KSP thanks [MENTION=2232183]Overmann[/MENTION]

- GS - Note "version unmatch" error and fix below No issue experienced on MTCE going from JY 2.80 to GS 2.78 and back to HA 2.80 - March 2018

- GS compatible on MX (see post #513)

- HA (v2.56 06/07/17 - note v2.52 on enables "shutdown delay when acc off" menu) HA MTCE (30/09/17) V2.65 https://www.sendspace.com/pro/dl/ufie8k

See this thread for pics where MCU HA and KD has been applied on JY. https://xdaforums.com/showpost.php?p=72737797&postcount=640

I initially upgraded to KD 2.40, then HA v2.52 after first exporting the MCU settings.

Note that I had to reapply MCU settings in [factory sertings] to configure radio, LED, bluetooth, hardware keys, volume levels between radio, bluetooth, system etc.

MCUs were previously thought to be manufacturer specific - e.g. HA, JY, GS, KD, however I have found that they are compatible and of interest where there is either a specific issue with your MCU (e.g. bluetooth out of one speaker, to enable PX5 sleep mode control) or the vendor has long ceased to support & release updates - such as JY.

MCU cross-compatibility became of interest to me when I upgraded my JY [MCU v2.06_2] PX3 with a HCT PX5 SOM and wanted to enable the MCU specific menu item [shutdown delay when ACC off] to control sleep as found on HA/Dasaita.

I first noted that from an XDA post listing JY an KD v2.06_2 being identical and on that assumption, upgraded to KDv2.40_2, which successfully applied - but had to reconfigure factory settings.

Following on, I found a post which has an image of a GS board & MCU chip - noted it was identical to the MTCD JY MCU chip [STM32F091] - then came across a post where a user had inadvertently applied a MTCD GS MCU to a MTCD JY without bricking it.

I then started comparing same version number firmware files from various manufacturer MCUs with a text compare tool. From this work, I had enough info to compare the latest HA v2.52 and conclude it 'should' be compatible. Indeed it is.

As always, check first (suggest confirming MTCD, MCU Chip part number, view/compare the fw files, ensure you have original MCU FW, backup MCU settings or document the settings to ensure your hardware controls, volume control, bluetooth, radio, canbus etc are setup correctly). Apply at your own risk.

Please post your results and I will update this thread.

Updates:

UPDATE: 26/06/2017 Users of 800x480 Users must also apply file[dmcu.ext], a text file containing:

For PX3 --> screen:3

For PX5 --> screen:1

01/07/17 - MLT

06/07/17 - KGL confirmed and new HA v2.56

30/09/17 - MTCE MCU confimed compatible

08/03/18 - MTCE JY/GS/HA compatible - No issue experienced on MTCE going from JY 2.80 to GS 2.78 and back to HA 2.80

GS Specific Notes:

Version unmatch

see this post where user resolved by reapplying MCU AND Software APK Fix Here

- Attached Version Unmatch APK fix to this post, thanks [MENTION=8817431]Wadzio[/MENTION]

GS Configuration Settings file:

Do not dilute this thread by posting "how-to" questions such as - how do I update the MCU, what unit do I have, can I do it, how do I find factory settings, etc. This thread is to document cross-compatible MCUs and the fixes they apply.