i totally agree with you.
you don't need your old files
here is my procedures:
1) download the package of 1.05f boroda. you can download it by this link
http://projects.mobileread.com/reade....upd.1.05f.zip
下載1.05f boroda的版本，你可以在這個聯結下載
2)after downloading this package, you extract it.
下載後解壓縮到你的電腦硬碟上
3) connect your prs600 with your computer, see which hard disc is your disc "reader" (let's assume it's M: now)
連接你的prs600到電腦上，看名叫reader的硬碟是在哪個槽，為講解方便，這裡暫定為 m槽
4) back to the folder you just extracted in step2. as you can see, there is a folder entitled "test-autorun" in it. now copy this "test-autorun" folder to your disc "reader" 's root catalogue (which we just assume is the hard disc M)
回到你剛解壓縮在電腦硬碟上的檔案，裡面有個夾叫test-autorun，把他複製到你reader硬碟的根目錄(就一進去)
5) now, open the folder you just extracted in step2, you can see "flash_reader.bat", double click it to make it work. there should be a window showing a question:
enter the letter of the reader drive?"
type the letter"m" and press "enter"
打開你剛解壓縮在電腦硬碟上的檔案，你可以看到個bat檔，叫做flash_reader，d ouble-click以運行。會跳出個dos視窗，讓你打入reader硬碟是在哪槽? 打入後按enter
6)the programme will work. after few seconds, the programme will ask you press any key to continue.
你會看到程式自已跑著，最後跑出一行字讓你按任意鍵繼續。按任意鍵後，dos視窗就自動關閉了 。
7)safely remove your prs600.
安全移除你的prs600
8) reset your prs600 (press the reset at its bottom, slightly plunk the power)
度下方的reset鍵後，輕撥power鍵以重開機
check <more>--><settings>--><about>, you are supposed to see in line3:
russified
orkupan (boroda) version:1.05f
those chinese-hacked editions are based on 1.o5d. if you rehacked with those editions you will miss your dictionaries again.
you sill can update your prs600 to the latest version(for now , it's 1.o.o1.o8o4o), it won't cover boroda's1.05f.
if you can't understand what i said, check boroda's web, there are some pictures to illustrate those procedures. and you can use google translation.
http://www.the-ebook.org/forum/viewtopic.php?t=12146
good luck.