Here's a quick guide on how to restore the visual bookmark thumbnails on the internet tab in Sense 2.5 after a flash (using Sashimi). You may need to learn how to use Sashimi before attempting this
Step 1) Assign your favorite bookmarks to the blank tabs in the internet tab in Sense 2.5
Step 2) Visit the favorite pages from step 1 so that manila takes a snapshot of the webpage and saves it as a thumbnail
Step 3) Back up the following registry keys and save them as .reg files for your Sashimi restore (note: restoring these keys will completely restore manila as you currently have it - tabs, settings, and all):
HKEY_CURRENT_USER\Software\HTC\Manila
HKEY_LOCAL_MACHINE\Software\HTC\Manila
Step 4) Back up the
vb.vol file in the \Windows directory
Step 5) Back up the 'Thumbnails' folder in the \Windows directory
Step 6) Now that you've backed up the thumbnails folder, the
vb.vol file, and the two manila .reg files, all you need to do after each time you flash is simply restore these files automatically with Sashimi