# Jetson Nano doesn't boot **URL:** \ **Category:** Jetson Nano\ **Tags:** boot\ **Created:** [February 14, 2022, 6:21am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395 "2022-02-14T06:21:57Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![tmid0819](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@tmid0819](https://forums.developer.nvidia.com/u/tmid0819)\ **Post date:** [February 14, 2022, 6:21am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/1 "2022-02-14T06:21:57Z")
The Jetson nano I’m using has jetpack 4.5 installed. It could still be used normally the day before yesterday. Until yesterday, there might have been electric problems, resulting in abnormal boots and shutdown. I am now stuck on the boots screen: ![S__37519363](https://global.discourse-cdn.com/nvidia/original/3X/9/2/92c2aa8f762f89167e895cd818d997c63262ca89.jpeg) Is there anything I can do to fix it? ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [February 14, 2022, 6:23am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/2 "2022-02-14T06:23:08Z")
You can flash the whole board with sdkmanager. Need to use natvie x86\_64 ubuntu 18.04 host. ---
**Author:** ![tmid0819](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@tmid0819](https://forums.developer.nvidia.com/u/tmid0819)\ **Post date:** [February 14, 2022, 6:28am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/3 "2022-02-14T06:28:46Z")
Hi @WayneWWW , thanks for your reply. For “flash the whole board” What should I do? Is it similar to how I installed jetpack to the sd card? ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [February 14, 2022, 6:30am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/4 "2022-02-14T06:30:24Z")
No, this is different. SDcard image is more like a entry level tool we provide. If something goes wrong and affect the boot, sdkmanager will format the board and re-install the whole bootloader+ rootfs to the QSPI device on the module and also the sdcard. ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [February 14, 2022, 6:31am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/5 "2022-02-14T06:31:41Z")
> **[NVIDIA SDK Manager](https://developer.nvidia.com/nvidia-sdk-manager)** > > Everything You Need to Set Up Your Development Environment NVIDIA SDK Manager provides an end-to-end development environment setup solution for NVIDIA’s DRIVE, Jetson, Holoscan, Rivermax, DOCA and Ethernet Switch SDKs for both host and target... Here is the sdkmanager tool. ---
**Author:** ![tmid0819](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@tmid0819](https://forums.developer.nvidia.com/u/tmid0819)\ **Post date:** [February 14, 2022, 6:33am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/6 "2022-02-14T06:33:43Z")
> [@WayneWWW](#): > > If something goes wrong and affect the boot, sdkmanager will format the board and re-install the whole bootloader+ rootfs to the QSPI device on the module and also the sdcard. Is it possible to re-flash without affecting the files in the sd card? ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [February 14, 2022, 6:36am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/7 "2022-02-14T06:36:24Z")
There are lots of points here 1. Actually, I don’t think your board is not able to boot. It is more like that it fails to launch the desktop. To check this, you can use the uart console, [Jetson Nano Style - Serial Console - JetsonHacks](https://www.jetsonhacks.com/2019/04/19/jetson-nano-serial-console/) 2. I don’t think your issue requires to re-flash the whole board, however, the error is possibly inside the rootfs, which means still inside your sdcard. Thus, no matter what case, this sdcard may need to get formatted. So using sdkmanager maybe a quick way. 3. If you don’t know what I am talking about, I can send the explanation in Mandarin. ---
**Author:** ![tmid0819](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@tmid0819](https://forums.developer.nvidia.com/u/tmid0819)\ **Post date:** [February 14, 2022, 6:47am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/8 "2022-02-14T06:47:10Z")
Thank you for your reply, I can understand a little what you mean, and I also feel that my situation is more like not being able to open the desktop, or the user login interface. For this part you suggest me to formatted sdcard directly, is that right? ---
**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\ **Post date:** [February 14, 2022, 6:49am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/9 "2022-02-14T06:49:38Z")
1. If you want to backup some files, use remote access like ssh to access the board and copy the file out. But this requires to make sure my previous point (1) is correct. 2. If you want to clean setup, then using sdkmanager to flash the board would be better. There are some issues that cannot be resolved by only using sdcard image. ---
**Author:** ![tmid0819](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@tmid0819](https://forums.developer.nvidia.com/u/tmid0819)\ **Post date:** [February 14, 2022, 7:02am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/10 "2022-02-14T07:02:25Z")
My situation is quite complicated, because when I use this nano, I manually connect to a hidden wifi, so ssh access is a little troublesome. I’ll try formatted sdcard first, if it still can’t boot normally, I’ll flash the board. ---
**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\ **Post date:** [February 28, 2022, 7:02am UTC](https://forums.developer.nvidia.com/t/jetson-nano-doesnt-boot/203395/11 "2022-02-28T07:02:55Z")
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