The 27 files (or map updates) are in the Navi\Maps\XXXX folder (where XXXX are unique folder names, and you can have many of those). If you have copied the 27 files correctly, just dump them in the XXXX folder. Then select your 'new' map through the 'Advanced Setting' menu.
The 'history' (maybe you meant 'Favorites') are stored in the Navi\Save folder. I think they are named PPGPOI17.DAT. Normally when updating maps, these are always intact because they are in a separate folder. If however, you updated the software (as in X5 SE), everything including the 'Save' folder gets overwritten and you lose your 'history'. Remember to always make backups especially before updating the software.
It is 'history - the places i've nagivated before', i still have my 'favorites - places i've book mark'. Do you know which folder i can find the 'history' file?
Updating the maps doesn't affect the history and favourites. The history and favourites will be lost if you update the new software only.
However, you can backup the Save folder and transfer back to Navi folder after the software updates. But you need to delete the sys.cfg that located in the Save folder as well..
Is that mean i copy out the 'save' folder from my R5800 to my PC, then i do the update. Then i transfer back all the content in save folder (except sys.cfg) from my PC to my R5800.
Correct me if i am wrong. Thank you