Our Nexus 7 (first version) was super slow since it was updated to android version 5.x so I decided to install version 4.4.4 which is the latest version before version 5. I tried to downgrade by the instructions supported by Google but it did not work and I have to call some additional commands. See solution section.<\/p>\n

Hopefully the tablet is a little bit faster with version 4.4.4.<\/p>\n

Before I started I have to enable USB-Debuging in the Developertools on my device.<\/p>\n

Link to the Google factory images: https:\/\/developers.google.com\/android\/images#instructions<\/a><\/p>\n

Problem<\/h1>\n

I called the following command as recommended in the instructions:<\/p>\n

.\/flash-all.sh<\/pre>\n
Result (quite long but it failed):<\/p>\n
(bootloader) Bootloader is already unlocked\r\nOKAY [\u00a0 0.017s]\r\nfinished. total time: 0.017s\r\nerasing 'boot'...\r\nOKAY [\u00a0 0.041s]\r\nfinished. total time: 0.041s\r\n******** Did you mean to fastboot format this ext4 partition?\r\nerasing 'cache'...\r\nOKAY [\u00a0 0.100s]\r\nfinished. total time: 0.100s\r\nerasing 'recovery'...\r\nOKAY [\u00a0 0.034s]\r\nfinished. total time: 0.034s\r\n******** Did you mean to fastboot format this ext4 partition?\r\nerasing 'system'...\r\nOKAY [\u00a0 0.126s]\r\nfinished. total time: 0.126s\r\n******** Did you mean to fastboot format this ext4 partition?\r\nerasing 'userdata'...\r\nOKAY [\u00a0 4.993s]\r\nfinished. total time: 4.993s\r\ntarget didn't report max-download-size\r\nsending 'bootloader' (2100 KB)...\r\nOKAY [\u00a0 0.259s]\r\nwriting 'bootloader'...\r\nOKAY [\u00a0 1.228s]\r\nfinished. total time: 1.487s\r\nrebooting into bootloader...\r\nOKAY [\u00a0 0.024s]\r\nfinished. total time: 0.093s\r\ntarget didn't report max-download-size\r\nsending 'radio' (16384 KB)...\r\nOKAY [\u00a0 2.003s]\r\nwriting 'radio'...\r\nFAILED (remote: (BadParameter))\r\nfinished. total time: 2.024s\r\nrebooting into bootloader...\r\nOKAY [\u00a0 0.024s]\r\nfinished. total time: 0.075s\r\ntarget didn't report max-download-size\r\narchive does not contain 'boot.sig'\r\narchive does not contain 'recovery.sig'\r\narchive does not contain 'system.sig'\r\narchive does not contain 'vendor.img'\r\nwiping userdata...\r\nCreating filesystem with parameters:\r\n\u00a0\u00a0\u00a0 Size: 30080499712\r\n\u00a0\u00a0\u00a0 Block size: 4096\r\n\u00a0\u00a0\u00a0 Blocks per group: 32768\r\n\u00a0\u00a0\u00a0 Inodes per group: 8160\r\n\u00a0\u00a0\u00a0 Inode size: 256\r\n\u00a0\u00a0\u00a0 Journal blocks: 32768\r\n\u00a0\u00a0\u00a0 Label: \r\n\u00a0\u00a0\u00a0 Blocks: 7343872\r\n\u00a0\u00a0\u00a0 Block groups: 225\r\n\u00a0\u00a0\u00a0 Reserved block group size: 1024\r\nCreated filesystem with 11\/1836000 inodes and 159268\/7343872 blocks\r\nwiping cache...\r\nCreating filesystem with parameters:\r\n\u00a0\u00a0\u00a0 Size: 464519168\r\n\u00a0\u00a0\u00a0 Block size: 4096\r\n\u00a0\u00a0\u00a0 Blocks per group: 32768\r\n\u00a0\u00a0\u00a0 Inodes per group: 7088\r\n\u00a0\u00a0\u00a0 Inode size: 256\r\n\u00a0\u00a0\u00a0 Journal blocks: 1772\r\n\u00a0\u00a0\u00a0 Label: \r\n\u00a0\u00a0\u00a0 Blocks: 113408\r\n\u00a0\u00a0\u00a0 Block groups: 4\r\n\u00a0\u00a0\u00a0 Reserved block group size: 31\r\nCreated filesystem with 11\/28352 inodes and 3654\/113408 blocks\r\n--------------------------------------------\r\nBootloader Version...: 4.23\r\nBaseband Version.....: N\/A\r\nSerial Number........: 015d4a8224542009\r\n--------------------------------------------\r\nchecking product...\r\nOKAY [\u00a0 0.030s]\r\nchecking version-bootloader...\r\nOKAY [\u00a0 0.021s]\r\nchecking version-baseband...\r\nFAILED\r\n\r\nDevice version-baseband is 'N\/A'.\r\nUpdate requires '1231_0.18.0_0409'.\r\n\r\nfinished. total time: 0.180s<\/pre>\n
 <\/p>\n
Solution<\/h1>\n
This first command failed as you can see above. After this i unziped the following file image-nakasig-ktu84p.zip which contains the four files boot.img, system.img, recovery.img and userdata.img. Which have to be flashed seperatly:<\/p>\n
fastboot flash boot boot.img\r\nfastboot flash system system.img\r\nfastboot flash recovery recovery.img\r\nfastboot flash userdata userdata.img<\/pre>\n
After I called these commands I restarted the Device and it worked.<\/p>\n
 <\/p>\n
Here is a description how to disable the update notifications if you use a old android version:<\/p>\n
https:\/\/android.stackexchange.com\/questions\/100991\/how-do-i-skip-an-android-system-update-and-stop-its-notifications<\/a><\/p>\n
 <\/p>\n
Source of the featured image: https:\/\/de.wikipedia.org\/wiki\/Android_%28Betriebssystem%29#\/media\/File:Android_logo_%282014%29.svg<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Our Nexus 7 (first version) was super slow since it was updated to android version 5.x so I decided to install version 4.4.4 which is the latest version before version 5. I tried to downgrade by the instructions supported by Google but it did not work and I have to call some additional commands. See […]<\/p>\n","protected":false},"author":1,"featured_media":1073,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,47],"tags":[50,20,60],"class_list":{"0":"post-1062","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-linux","8":"category-mobile","9":"tag-android","10":"tag-linux","11":"tag-tablet","12":"czr-hentry"},"_links":{"self":[{"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/posts\/1062","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/comments?post=1062"}],"version-history":[{"count":9,"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/posts\/1062\/revisions"}],"predecessor-version":[{"id":1080,"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/posts\/1062\/revisions\/1080"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/media\/1073"}],"wp:attachment":[{"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/media?parent=1062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/categories?post=1062"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/elise-robert.de\/wp-json\/wp\/v2\/tags?post=1062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}