What software should i upgrade for my china GPS ?

i am using a china GPS for quite a long time
recently it may show error and hang middle of navigation so i plan to format it and install a new software
i dont know what model of my GPS
Need help thank..
Normally i use papago.. so i dont mind only papago inside after reinstall sotfware
Plz need help, thx.

below photo show GPS device that i am using, thank you.

3814
3815

finally i success check from system info, it show:
lark_freebird_5016
AT8X0 6.0
windows embedded CE 6.0
54.8 MB RAM
ARM1136JF-S AT840
480x272 pixels, 65536 colors

Port: COM1
Baudrate: 4800
Protocol: NMEA

what should i do now ?

Success to upgade papago SEX5.

May i know how to Flash the GPS firmware ?