MobileRead Forums - View Single Post - Is there any possible way to get the old firmware of GL4?

plainbriny · 06-20-2024, 03:17 AM

It is possible to downgrade, but you need to get the 'update.zip' file for the specific version you want to downgrade to.

As Renate pointed out (on XDA), the lateset firmware can be found from manifest on B&N website.
For GL4, it's
https://www.nook.com/services/cms/do...ifest_rel.json
for GL4e, it's
https://www.nook.com/services/cms/do...ifest_rel.json
for GL4 plus, it's
https://www.nook.com/services/cms/do...ifest_rel.json

From this we can find the url to the latest 'update.zip'.
For example, the latest firmware for GL4 is 8.1.4.102 (mine still on 8.1.4.95): http://su.barnesandnoble.com/nook/pi...102/update.zip
One can experiment on the version number to get previous versions.
For example, the last version was 8.1.4.95, so the url would be:
http://su.barnesandnoble.com/nook/pi....95/update.zip
And the version before that one was 8.1.4.88 (development not locked), the url is:
http://su.barnesandnoble.com/nook/pi....88/update.zip
and so on... (I have got 8.1.3.123, 8.1.2.112, 8.1.1.110, etc)
If you know the specific version number, you can get it directly from the url.

Once you get the update.zip file for the version you want, put it to the internal storage of your device, the root directory is fine. Keep your device plugged to a power source, and it will update (downgrade) to the version you want.

06-20-2024, 03:17 AM	#9
plainbriny Enthusiast Posts: 45 Karma: 294 Join Date: Dec 2017 Device: Kindle 3 Keyboard, Nook Glowlight 3/4, Glowlight 4+	It is possible to downgrade, but you need to get the 'update.zip' file for the specific version you want to downgrade to. As Renate pointed out (on XDA), the lateset firmware can be found from manifest on B&N website. For GL4, it's https://www.nook.com/services/cms/do...ifest_rel.json for GL4e, it's https://www.nook.com/services/cms/do...ifest_rel.json for GL4 plus, it's https://www.nook.com/services/cms/do...ifest_rel.json From this we can find the url to the latest 'update.zip'. For example, the latest firmware for GL4 is 8.1.4.102 (mine still on 8.1.4.95): http://su.barnesandnoble.com/nook/pi...102/update.zip One can experiment on the version number to get previous versions. For example, the last version was 8.1.4.95, so the url would be: http://su.barnesandnoble.com/nook/pi....95/update.zip And the version before that one was 8.1.4.88 (development not locked), the url is: http://su.barnesandnoble.com/nook/pi....88/update.zip and so on... (I have got 8.1.3.123, 8.1.2.112, 8.1.1.110, etc) If you know the specific version number, you can get it directly from the url. Once you get the update.zip file for the version you want, put it to the internal storage of your device, the root directory is fine. Keep your device plugged to a power source, and it will update (downgrade) to the version you want.