These are the steps:
1. Make sure your 3 days trial of your MyWi has expired (if not enjoy your 3 days trial first)
2. After it's expired make sure you take a note or remember the date you install MyWi
3. Uninstall ur current mywi from cydia
4. Reboot ur iPhone
5. Open cydia and add new repo: http://hackstor.myrepospace.com
6. Install package: MyWi cracked version 4.7.7
7. Exit from cydia and open MyWi
8. Go to iFile (i assume you already installed iFile from Cydia)
9. Go to Folder: \var\stash\Application\MyWiApp
10. Find file called: MyWiApp
11. Open with textviewer and change the date there with your date on step 2 above
12. save and exit iFile
13. Go to MyWi and tap to open it
14. It will give u a warning window "exit | reboot --> tap exit
15. Open again MyWi and it will give u the same warning window as before and please tap exit again
16. Open again MyWi and now please tap REBOOT
17. Wait your iPhone reboot
18. Done rebooting, open again your MyWi and VOILA!!!!!!!! Now your MyWi active again!!!!!
G,lak!!