Yes, use the files I linked in the post above. Copy to the root of your external SD card (sd-ext).
To get into stock recovery: power off. Hold volume up and down together, and power on. Use volume down to highlight Recovery and volume up to select. When you get to the ! screen, press volume up and down again to bring up the menu. Then use volume keys to highlight Update from Zip and tap power button to select. Use volume keys to highlight the update file, tap power again and it should install.
I would install the
.893 update first, then boot up and root, and Forever Root. Then go back into recovery to install the
.902 update.
Keep in mind that Moto names their files after the version you are coming FROM, not the version you're going TO. Just so you don't confuse the two files.