Try it, I read that it might just work. If any thing it will just bring up an error and you can easily recover from this by removing the usb cable from the phone and removing the phones battery, replace the battery and power up the phone.
okay so if that didnt work, try this :
ftp://xda
da@ftp.xda-developers.com..._2.13_CDMA.rar
you gna need to rename the file to RUU_signed.nbh
after renaming it, drag the .nbh file into an empty RUU and run the ROMUpdateUtility.exe. if you dont have your own empty RUU, here is one :
RUU.zip
(press the ctrl key and click the zip file)