# Using Device API for checking new update **URL:** \ **Category:** General Discussions\ **Created:** [February 14, 2021, 9:51am UTC](https://hub.mender.io/t/using-device-api-for-checking-new-update/3219 "2021-02-14T09:51:46Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![SamanRatna](https://avatars.discourse-cdn.com/v4/letter/s/6a8cbe/32.png) [@SamanRatna](https://hub.mender.io/u/SamanRatna)\ **Post date:** [February 14, 2021, 9:51am UTC](https://hub.mender.io/t/using-device-api-for-checking-new-update/3219/1 "2021-02-14T09:51:46Z")
Hi there, I worked on the Check for update API for devices. It gives amazon AWS link for the latest pending update. How can the device explicitly download and install the update? I am guessing that the link should facilitate to accomplish it. And, what is the difference between ‘Check Update API’ and ‘Check Update depends API’ ? Thanks in advance. Regards, Saman ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [February 14, 2021, 3:27pm UTC](https://hub.mender.io/t/using-device-api-for-checking-new-update/3219/2 "2021-02-14T15:27:49Z")
Once you have the URL you can use [standalone mode](https://docs.mender.io/artifact-creation/standalone-deployment) to install it. As for the differences between the APIs, the “Check update depends” will provide an update match a specific set of ArtifactProvides. See [this link](https://docs.mender.io/artifact-creation/software-versioning) for full details on the versioning that is part of Mender. Drew ---
**Author:** ![SamanRatna](https://avatars.discourse-cdn.com/v4/letter/s/6a8cbe/32.png) [@SamanRatna](https://hub.mender.io/u/SamanRatna)\ **Post date:** [February 15, 2021, 7:38am UTC](https://hub.mender.io/t/using-device-api-for-checking-new-update/3219/3 "2021-02-15T07:38:20Z")
Can the standalone method be implemented for Application update? ## I get the following error… ``` pi@projectzero:/etc/mender $ sudo mender -install https://s3.amazonaws.com/hosted-mender-artifacts/5f9febf5f3379557fad08339/eebae7d6-53ca-4dd8-a8e8-b012ba6f3c59?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAQWI25QR6MOCESDWO%2F20210215%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20210215T073042Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&response-content-type=application%2Fvnd.mender-artifact&X-Amz-Signature=52f0c78f071a5742b6b9963ec2f242adb5d6f1f02a9c11830589df9299539626 **[1] 17499** **[2] 17500** **[3] 17501** **-bash: X-Amz-Credential=AKIAQWI25QR6MOCESDWO%2F20210215%2Fus-east-1%2Fs3%2Faws4_request: command not found** **[4] 17502** **[5] 17503** **[6] 17504** **-bash: X-Amz-Expires=86400: command not found** **-bash: response-content-type=application%2Fvnd.mender-artifact: command not found** **-bash: X-Amz-SignedHeaders=host: command not found** **-bash: X-Amz-Signature=52f0c78f071a5742b6b9963ec2f242adb5d6f1f02a9c11830589df9299539626: command not found** **[2] Exit 127 X-Amz-Credential=AKIAQWI25QR6MOCESDWO%2F20210215%2Fus-east-1%2Fs3%2Faws4_request** **[4] Exit 127 X-Amz-Expires=86400** **[6]+ Exit 127 response-content-type=application%2Fvnd.mender-artifact** **[5]+ Exit 127 X-Amz-SignedHeaders=host** **pi@projectzero:/etc/mender $ -bash: X-Amz-Date=20210215T073042Z: command not found** **INFO[0000] Loaded configuration file: /etc/mender/mender.conf** **INFO[0000] No dual rootfs configuration present** **ERRO[0000] Failed to Load the Server certificate. Err SSL errors:** **WARN[0000] Failed to load the server TLS certificate settings: SSL errors:** **INFO[0000] Performing remote update from: [https://s3.amazonaws.com/hosted-mender-artifacts/5f9febf5f3379557fad08339/eebae7d6-53ca-4dd8-a8e8-b012ba6f3c59?X-Amz-Algorithm=AWS4-HMAC-SHA256].** **ERRO[0002] Error fetching scheduled update info: code (400)** **ERRO[0002] Error while installing Artifact from command line: (request_id: ): error receiving scheduled update information server error message: failed to parse server response: invalid character '<' looking for beginning of value** **--------------------------------------------------------------------------------------** ``` Saman ---
**Author:** ![dellgreen](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/dellgreen/32/85_2.png) [@dellgreen](https://hub.mender.io/u/dellgreen)\ **Post date:** [February 15, 2021, 9:45am UTC](https://hub.mender.io/t/using-device-api-for-checking-new-update/3219/4 "2021-02-15T09:45:46Z")
Command line interpreter issue maybe, have you tried wrapping the URL in single quotes? ---
**Author:** ![SamanRatna](https://avatars.discourse-cdn.com/v4/letter/s/6a8cbe/32.png) [@SamanRatna](https://hub.mender.io/u/SamanRatna)\ **Post date:** [February 15, 2021, 5:18pm UTC](https://hub.mender.io/t/using-device-api-for-checking-new-update/3219/5 "2021-02-15T17:18:06Z")
Yes, I have. It’s not helping sadly ☹ Could there be some kind of SSL certificate error. I am using hosted mender server as of now with the following hardware configuration: Raspberry pi 4 Raspberry pi Lite OS, Raspbian GNU/Linux 10 (buster), Kernel version 5.10.11-v7l+ #1399 Mender client version 2.5.0 openssl version 1.1.1d - Saman ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [February 15, 2021, 5:34pm UTC](https://hub.mender.io/t/using-device-api-for-checking-new-update/3219/6 "2021-02-15T17:34:52Z")
It’s definitely an issue with the quoting. I can see that your shell is trying to run things in the background since using the ‘&’ string will do that. It’s definitely splitting your command on the ‘&’ characters. Try running the following: > pi@projectzero:/etc/mender $ sudo mender -install ‘[https://s3.amazonaws.com/hosted-mender-artifacts/5f9febf5f3379557fad08339/eebae7d6-53ca-4dd8-a8e8-b012ba6f3c59?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAQWI25QR6MOCESDWO%2F20210215%2Fus-east-1%2Fs3%2Faws4\_request&X-Amz-Date=20210215T073042Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&response-content-type=application%2Fvnd.mender-artifact&X-Amz-Signature=52f0c78f071a5742b6b9963ec2f242adb5d6f1f02a9c11830589df9299539626](https://s3.amazonaws.com/hosted-mender-artifacts/5f9febf5f3379557fad08339/eebae7d6-53ca-4dd8-a8e8-b012ba6f3c59?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAQWI25QR6MOCESDWO%2F20210215%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20210215T073042Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&response-content-type=application%2Fvnd.mender-artifact&X-Amz-Signature=52f0c78f071a5742b6b9963ec2f242adb5d6f1f02a9c11830589df9299539626)’ It should be all a single line in your shell prompt.