I have seen a lot of users searching frantically for Firmware for their Chinese double din WinCe 6.0 units (me included). After a painful googling for several months,
I have stumbled upon this Chinese link. You can open the link and then 'Right Click' and translate it with Bing.
Check your earlier firmware from your unit 'info' and download same MCU software for your model.
i.e. 9023 or 9024 or 9026 etc.
Mine was 9023 and the new software was a pleasant update which resolved all issues.
Extract the downloaded files to root of newly formatted SD card.
You can replace Chinese logo and background before installation by browsing to ZYupdate/ZY8840 res/skin1 and change bk.bmp (background)
and logo.bmp (Bootup logo) with pictures of your choice. Pictures should be only of 800x480 pixel size and saved as 16/24 bit .bmp images. Use mspaint.exe
on your pc for editing and saving any picture for this purpose.
Now put SD card in your GPS slot.
Switch on your unit and wait for upgrade to complete. The software will install in Chinese.
When unit shuts down, quickly remove SD card and wait for restart.
After screen calibration, click on settings icon and change interface language to English.
For steering wheel settings and other modifications use password 3368, when asked.
Finally here is Chinese link: [Please Register or Login to download file]
Enjoy new interface and faster car gps. feel free to ask any doubts, I shall be glad to help.