[omnismart]

He estado cambiando ROM, tanto backups como nuevas versiones y no he tenido ningún problema, uso

4EXT Recovery Touch v1.0.0.5 RC3
en wipe/format selecciono format all partitions (except sdcard) su nombre lo dice
y allí mismo selecciono data/factory reset para borrar los datos generados en la MicroSD

Con eso debería ser suficiente, aún así aplico el ArieLuXo d0_0b Super Wipe.zip, que realmente ya no sería necesario.

Les pego el code de ArieLuXo, para que sepan que hace.

#
# Updater-script for ArieLuXo
#       *dO_Ob* 
# Te vas a enterar xD !!! (: 

ui_print("");
ui_print("");
ui_print("");
ui_print("==============================================");
ui_print("|               Super Wipe              |");
ui_print("|  Esta operacion borrara todos tus datos |");
ui_print("|No Te Asustes, No Formatea Tu SD|");
ui_print("|  Tienes 10 Segundos para quitar la bateria|");
ui_print("|          Y Cancelar el proceso      |");
ui_print("==============================================");
ui_print("");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "10");
ui_print("1. Erasing & formatting EXT4 *CACHE* partition");
assert(unmount("/cache") || ui_print("(cache is unmounted already)"));
run_program("/sbin/erase_image", "cache");
format("ext4", "EMMC", "/dev/block/mmcblk0p27");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "5");
ui_print("2. Erasing & formatting EXT4 *SYSTEM* partition");
assert(unmount("/system") || ui_print("(system is unmounted already)"));
run_program("/sbin/erase_image", "system");
format("ext4", "EMMC", "/dev/block/mmcblk0p25");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "5");
ui_print("3. Erasing & formatting EXT4 *DATA* partition");
assert(unmount("/data") || ui_print("(data is unmounted already)"));
run_program("/sbin/erase_image", "userdata");
format("ext4", "EMMC", "/dev/block/mmcblk0p26");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "5");
ui_print("4. Erasing *BOOT* partition");
assert(unmount("/boot") || ui_print("(boot is unmounted already)"));
run_program("/sbin/erase_image", "boot");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "5");
ui_print("5. Removing system files from SD Card");
delete_recursive("/sdcard/.android_secure");
delete_recursive("/sdcard/.bookmark_thumb1");
delete_recursive("/sdcard/.data/footprints");
delete_recursive("/sdcard/.data/mail");
delete_recursive("/sdcard/Android/data/com.android.providers.media");
delete_recursive("/sdcard/Android/data/com.google.android.apps.genie.geniewidget.news-content-cache");
delete_recursive("/sdcard/Android/data/com.google.android.apps.maps");
delete_recursive("/sdcard/.data/navigator/Data/Temporary");
delete_recursive("/sdcard/LazyList");
delete_recursive("/sdcard/LOST.DIR");
ui_print("");
ui_print("");
ui_print("");
ui_print(">>> All partition wiped successfully! <<<");
ui_print("");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "5");
ui_print("6. Now checking filesystems for errors");
run_program("/sbin/e2fsck", "-p", "/dev/block/mmcblk0p25");
run_program("/sbin/e2fsck", "-p", "/dev/block/mmcblk0p26");
run_program("/sbin/e2fsck", "-p", "/dev/block/mmcblk0p27");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "5");
ui_print("7. Creating log file on SD card");
run_program("/sbin/busybox", "cp", "/tmp/recovery.log", "/sdcard/superwipe.log");
ui_print("");
ui_print("");
run_program("/sbin/sleep", "5");
ui_print("==============================================");
ui_print("|  Ahora puedes flashear tu ROM    |");
ui_print("|    Se reiniciara en Recovery    |");
ui_print("| No Olvides Visitar www.HTCmania.com    |");
ui_print("==============================================");
run_program("/sbin/sleep", "5");
run_program("/sbin/reboot", "recovery");

Saludos.