[MTCD  Android Head Units Q&A] rc09mi:
Hi,

New to XDA, amazing place!

Did a search and nothing posted has helped except perhaps attempting maskrom, but I don't want to void my warranty in case I have to argue with Xtrons via aliexpress (want to leave the case uncracked).

Hope someone can give advice on something further to try to fix my issue as Xtrons won't do an RMA since they feel the bootloop is because I didn't allow updates to complete (which is not the case).

Trying to keep it brief:

my hu: Xtrons TE103AP (px5) CPU: 8 core 64-bit CPU Cortex-A53 @ 1.5G

Andy vers: 8.0.0 Oreo

Kernel vers: 4.4.93+, rocky@hctr930 #343, sat sep 15 2018

MTCE_GS_v2.94.3, sep 13 2018

Mem: 3891MB

The scoop:

Last week during a very cold day (windchill -31C) (probably not a factor) the unit locked up while Waze and PowerAmp where running. I was driving (so left it be) and after awhile it rebooted itself to a (recovery) screen with two choices:

1) Factory Reset

2) Reboot

Chose 2) reboot. Screen blanked, that was all she wrote.

Got home (1.5 hours later), took out hu to trouble shoot and possibly reflash system rom inside house (if required).

Test boot (using bench PS (computer PS 12+V and GND rails)): System shows Oreo car multi-media logo for 6 seconds and then Toyota boot animation then blank for 6 seconds and then Oreo car multimedia logo (for 6 sec) again, then blank for 6s then Oreo logo again for 6 sec... (Oreo bootloop). Link: removed Dropbox url - becasue: I'm too new

Contacted Xtrons (via aliexpress) they were quick to offer a link to ROM (sep 20, 2018 vers) Link: removed Dropbox url

and a poorly written, incomplete instruction sheet. Link: removed Dropbox url

Procedure attempted and results:

Used reset toggle to enter stock recovery on a TE103AP:

step 1- use paperclip hold in rst abt 20s (@ 15s panel lights will flash on an off), released for 1s, then

step 2- hold in rst for 3s, release for 1s, then

step 3- click RST (release immediately)

Get E: mount errors for ntfs? Just below the recovery Menu. (I'm assuming it's because I used 128GB tf in GPS and SD slots when hu was working (tfs formatted by Chrome OS, so why ntfs???) and now they are not there. Assuming this doesn't affect problem???)

E: trying mount /dev/block/mmcblk0p1 to ntfs.

E: tring mount /dev/block/mmcblk0 ntfs.

E: failed to mount /mnt/external_sd error: No such device

E: trying mount /dev/block/mmcblk0p1 to ntfs.

E: tring mount /dev/block/mmcblk0 ntfs.

E: failed to mount /mnt/external_sd error: No such device

(verbatim)

Used RESET (rst) to move selection to wipe cache and select (successful) and then factory reset (successful), then inserted TF (16GB FAT32) card with unzipped files) into GPS slot (SD slot (2nd TF slot) left empty).

Moved selection to Update system ROM, select (after 290.7s update successful) returned back to stock recovery menu.

Moved selection to Update MCU, selected. Checks for ROM (OK), flashes MCU (Front panel lights flash on and off). Successful.

System reboots itself: Screen flashes with Oreo logo (car multimedia system) for a few seconds and then blanks for 6 seconds and then Oreo logo reappears ad infinitum.

Link: removed Dropbox url

I have allowed the bootloop to run for 12 hours with no change.

I have also hard powered down (PS off) for 5-10 minutes and powered-on and get:

Oreo logo briefly, the Toyota Boot animation, starting android and a reboot to the 6s Oreo boot loop again or (sometimes) the homescreen (how I was able to get pictures of settings and attempt updates through settings). However, the hu will randomly start the 6s Oreo bootloop again.

Additionally, attempted update procedures:

2) stock recovery: factory reset, wipe cache, update system. select reboot in recovery. Result - same

3) stock recovery: wipe cache, factory reset, select reboot. Result - same

4) stock recovery: factory reset, wipe cache, update MCU (only). Auto-reboot (I release GPS card after it says successful). Result - same

5) From settings: Update system rom, (insert TF) select wipe option. (Successful). Select Update MCU (Successful). HU reboots automatic. Results - same

6) From settings: selcting update system rom OR MCU (successsful), rebooting. Results - same

7) From homescreen, insert TF card, Popup Update system ROM, select wipe option. Successful. Result - same.

Am I doing something wrong (as Xtrons assumes)?

What do I tell Xtrons it is so I can get an RMA and ultimately a working system?

Any help would be greatly appreciated!

Robert