Instructions for users who have the firmware KGD, and want to upgrade to Android2.3_10-28.
1) Install firmware 2.2 Froyo for example this:
2) If you do not have the boot and recovery 20110907SPI, you have to unzip it and select your model ATV (atv300 = 256 avt1000= 512 atv1000 (v.2.2) = 512F
Important renamed to update.zip and copy to SD card.
3) Follow instructions in the PDF.