APs cannot load the version file after the ap-update multi-load command is executed. How can I locate the problem

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Locate the problem as follows:
1. Check whether the version files stored in active and standby partitions of the flash memory are the same as version files to be loaded. The version files are loaded only when the version files stored in active and standby partitions of the flash memory are different from version files to be loaded.

2. In FTP or SFTP upgrade mode, check whether the file name and path are correct.

Other related questions:
APs are successfully loaded with version files in batches using FTP. Why are they reset repeatedly and loaded with the version files again
The fault occurs due to version ID mismatch. To rectify the fault, change the version ID in the AP upgrade file name to be the same as the version ID in the AP upgrade file.

Principles of AP load balancing
Load balancing can evenly distribute AP traffic loads to ensure high bandwidth for each STA. The load balancing function applies to wireless networks with high user densities to ensure proper access of STAs. Depending on whether a load balancing group needs to be manually created, load balancing is classified into static and dynamic load balancing. For details about the principles, see: V200R005: Configuring Load Balancing V200R006: Configuring Load Balancing

Why do many APs report failures when version files are loaded in FTP mode
The FTP server limits the number of connected users. When the number of users exceeds the threshold, new link requests are denied or APs fail to log in to the FTP server, which leads to the upgrade failure.

How do I batch upgrade APs of a specified type? Can I upgrade a specified AP
Perform the following operations to batch upgrade APs of the specified type: - V200R005 and earlier versions: 1. Run the ap-update mode { ftp-mode | ac-mode | sftp-mode } command in WLAN mode to set the AP upgrade mode. 2. Save the AP version file to the AC, FTP server or SFTP server. 3. Run the ap-update update-filename filename ap-type type-id [ region region-id ] command in WLAN mode to specify the AP upgrade file. You do not need to add flash:/ to the file name. 4. Run the ap-update multi-load type-id [ region region-id ] ommand in WLAN mode to batch upgrade APs of the specified type. You can only batch upgrade APs of a specified type or APs of a specified type in the same AP region. During AP login, if the software versions on the AP and AC are different, the AP is upgraded automatically. - V200R006 and later versions: 1. Run the ap update mode { ftp-mode | ac-mode | sftp-mode } command in WLAN mode to set the AP upgrade mode. 2. Save the AP version file to the AC, FTP server or SFTP server. 3. Run the ap update update-filename filename ap-type type-id [ ap-group ap-group-name ] command in WLAN mode to specify the AP upgrade file. You do not need to add flash:/ to the file name. 4. Run the ap update multi-load ap-type type-id [ ap-group ap-group-name | { ap-name ap-name | ap-id ap-id } &<1�?0> ] command in WLAN mode to batch upgrade APs of the specified type. During AP login, if the software versions on the AP and AC are different, the AP is upgraded automatically.

How to load the U1900 software version by running commands?
Go to and obtain the software version and upgrade guide of the desired model. Then upgrade or reload the U1900 software version by referring to the corresponding upgrade guide.

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