[Barnes & Noble Nook Tablet] nmyshkin:
Allright. Again, sorry for the delay. Let's get you started.

First, you should know that some people say their tablets will not boot from an SD card unless the power cord is plugged in (power pack or USB, either way). This has not been my experience with my two NTs, but if your tablet does not boot from the card the first time, try it again with the cord plugged in. Your tablet should be more or less fully charged.

OK, we are going to do five things:

1. Boot into the Cyanoboot loader. This is how you get to flash stuff and also access recovery. On the first boot from the SD card, the new bootloader is copied to the device and after that it will boot to Cyanoboot even without the card inserted.

a. Power the tablet down.

b. Insert the prepared SD card.

c. Power up the tablet. You should see the Cyanoboot logo. As soon as you do, press and hold the "n" button to display the boot menu. Use the volume-down button to move down to "SDC Recovery" and then press the "n" button (see screenshot below). TWRP should load up (see screenshot below)

IF the device boots to the regular B&N OS, power down. Then insert the power cable. The tablet should come on by itself and boot from the SD card.

IF the second boot attempt also fails, there is something wrong with the card. Let me know.

2. Backup the stock tablet OS. Technically you don't need this, but it's not a bad idea. Failing this, there is another way to restore the tablet to factory condition by preparing a special SD card for that purpose. The backup ends up on the SD card.

To know: TWRP is somewhat erratic on the NT. The touch interface is often inconsistent. Sometimes a single touch does what it should, other times what you tap on is simply highlighted and you have to tap on it a second time. This can be dangerous so go slowly and don't commit to a change unless everything on the screen looks right.

a. Tap on "Backup" (see screenshot below).

b. You want to backup everything that is shown as available (your image will be different from mine), so if there is something displayed on the left of the screen that is not "x"-ed, select it also. Be sure when you select that an "x" appears and there is no highlighting on the option. Highlighted options are not really selected. This can be a pain and you may have to dance with it a little, but you need the box with an "x" in it and NO highlighting on the entry.

c. Tap on "Storage: Internal Storage" and select the microSD card instead. Backups should always go on this special card and not internal storage because 1) they take up valuable space and 2) if the device fails to boot on its own, you may be able to boot from the SD card and restore a working backup.

d. Finally when you've checked all the boxes and changed the storage to the microSD card, use the slider to start the process. The slider can be temperamental. Press and hold for just a second or two and then drag to the right.

When the backup is complete, return to the "home" screen if it does not do that for you. You can use the "home" icon at the top right of the screen.

3. Wipe the internal storage (emmc). This gets rid of just about everything on the device and makes a clean sweep of things in preparation for flashing the CM13 ROM.

a. From the TWRP home screen select "Wipe" (see screenshot below).

b. Tap "Advanced" (see screenshot below).

c. Again here you want everything checked

EXCEPT

the microSD card. Otherwise you will erase the card (and the backup you just did) and have to start all over again.

Once again, make sure that there are "x"es in all the boxes (except for the microSD card) and that no entries are also highlighted. If one is highlighted, just retap as needed until the box remains with an "x" but the entry is no longer highlighted.

d. Press and slide the slider to initiate the wipe.

e.

Repeat the process

. The options of what to wipe may have changed slightly and not everything may be checked, so be sure to look closely. Everything should be checked EXCEPT the microSD card.

f. Return to TWRP home screen as before.

4. Flash the CWM zip to the internal storage (emmc) as a recovery program. This is a sort of fail-safe recovery. Generally you will use the TWRP recovery from the SD card to actually do things. But if the card should be damaged there will still be a functioning recovery on the device.

a. From the TWRP home screen tap on "Install".

b. At the top of the next screen it should show "Storage: microSD card" or something similar. If it says "Internal" instead, tap there and change it. If the setting is correct you will see a directory of installable items on the card. Tap on the flashable CWM zip. (see screenshot below).

c. Use the slider to execute the flash. I'm not sure where you end up after the flash. If you end up on the home screen again, tap on "Install" once more. If you end up on the page with the file directory, then you're ready for the last (!) step.

5. Flash the CM13 ROM zip. This places the new OS in the emmc (internal storage). Once this is done, rebooting the tablet brings it to setup mode just as if you were starting up a new phone for the first time.

a. Select the cm13 zip file to flash (see screenshot below).

b. Use the slider to execute the flash.

c. Return to the TWRP home screen.

d. Remove the SD card (keep somewhere safe!!!) and tap on "Reboot". Select "System" or "Power down". If you select "System" the tablet will reboot into the setup for CM13. There you can choose your language, set up the time zone, and Wi-Fi (untick or skip the business about feedback to the Cyanogenmod project; it's dead). This is basic Android out-of-the-box setup.

To turn off your "new" tablet, press and hold the power button until the "Power Down" option appears. Tap that.

More later, once you get this done.

Good luck :)