Trying to apply U18_V2.4.zip
I'm in the same boat as others... hoping to try out the U18 V2.4 update, but the OTA update always fails.
I have accomplished getting the V1.4 phone app installed and working. It failed to download for me, like some others have reported, but I was able to extract the APK from the U18_V2.4.zip file, and sideloaded U18_V2.4/SYSTEM/data/usmart.apk from the zip file onto my phone.
Now, here's some more clues on the failure of the OTA update on the watch. Look at /sdcard/logs/recovery/20150820_171751.log...
Here's an excerpt:
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update_package = /sdcard/USMART/update//U18_V2.4.zip
I:Finding update package...
I:Update location: /sdcard/USMART/update//U18_V2.4.zip
I
pening update package...
Installing update...
The update.zip is corrupted
Installation aborted.
write result : MOTA_RESULT_FILE
write result : remove_mota_file
----------------------------------------------------------
Looking for the strings "The update.zip is corrupted" and "write result : MOTA_RESULT_FILE" leads me to this webpage with the source of our recovery.c....
on github: andr3jx MTK6577 blob master bootable recovery recovery.c
Sorry I can't post a proper URL yet.
---------- Post added at 10:03 AM ---------- Previous post was at 09:41 AM ----------
Having read some more source code on github, one reason why "The update.zip is corrupted" would end up in the log is that the file is improperly signed. Ugh. This may be a dead end until the manufacturer fixes the "corrupt" update.