stm32 error A9555E

error A9555E 产生的原因：

“Error code "-25" indicates to that License server system does not support this version of the product. This usually means that you are trying to use an older license with a more recent tool. ”

意思是，你的破解许可证不支持你MDK的版本，通常意味着许可证的版本太落后匹配不上新版的工具。

解决方案：

1.可能是破解的过程出来问题，实在不行可以重新破解一遍或者重装MDK。

2.或者是联系 Flex license server administrator 去更新 the Flex license 

3. 又或者可以降低MDK的版本来适应你的许可证。

具体查看许可证匹配版本方法可以参考 

转载 http://www.keil.com/support/docs/3699.htm

Run lmutil.exe utility tool in your cmd.exe window as follows:

C:\keil_v5\UV4\FlexNet\lmutil.exe lmstat -c [email protected] -a -i

Please note that "[email protected]" should be replaced by the port@server_name of your Flex license server.

After such a command is executed, you will see the output similar as follows:

lmutil - Copyright (c) 1989-2014 Flexera Software LLC. All Rights Reserved.
Flexible License Manager status on Tue 4/28/2015 15:30

[Detecting lmgrd processes...]
License server status: [email protected]
    License file(s) on Flex-LIC-Server.Company.COM: C:\Flex-Server\license.dat:

  Flex-LIC-Server.Company.COM: license server UP (MASTER) v11.12.1

Vendor daemon status (on Flex-LIC-Server.Company.COM):

    armlmd: UP v11.12.1

Feature usage info:
Users of mdk_pro:          (Total of 1 license issued;  Total of 0 licenses in use)
Users of mdk_pro_µVision:  (Total of 1 license issued;  Total of 0 licenses in use)
Users of mdk_pro_armasm5:  (Total of 1 license issued;  Total of 0 licenses in use)
Users of mdk_pro_compiler5:(Total of 1 license issued;  Total of 0 licenses in use)
Users of mdk_pro_armlink5: (Total of 1 license issued;  Total of 0 licenses in use)
Users of mdk_pro_fromelf5: (Total of 1 license issued;  Total of 0 licenses in use)
Users of mdk_pro_arm_lcf5: (Total of 1 license issued;  Total of 0 licenses in use)

NOTE: lmstat -i does not give information from the server,
      but only reads the license file.  For this reason,
      lmstat -a is recommended instead.

Feature                         Version     #licenses    Expires      Vendor
_______                         _________   _________    __________   ______
mdk_pro                         5.0          1           1-jan-0      armlmd
mdk_pro                         5.0201408    1           1-jan-0      armlmd
mdk_pro_µVision                 5.0          1           1-jan-0      armlmd
mdk_pro_µVision                 5.0201408    1           1-jan-0      armlmd
mdk_pro_armasm5                 5.0          1           1-jan-0      armlmd
mdk_pro_armasm5                 5.0201408    1           1-jan-0      armlmd
mdk_pro_compiler5               5.0          1           1-jan-0      armlmd
mdk_pro_compiler5               5.0201408    1           1-jan-0      armlmd
mdk_pro_armlink5                5.0          1           1-jan-0      armlmd
mdk_pro_armlink5                5.0201408    1           1-jan-0      armlmd
mdk_pro_fromelf5                5.0          1           1-jan-0      armlmd
mdk_pro_fromelf5                5.0201408    1           1-jan-0      armlmd
mdk_pro_arm_lcf5                5.0          1           1-jan-0      armlmd
mdk_pro_arm_lcf5                5.0201408    1           1-jan-0      armlmd

From such an output you can see the version number 5.0201408 supported by the license on the Flex license server, which means this Flex license only support the products with the valid support date up to the end of August 2014 (201408 means 2014/08). However, your product requires a valid support and maintenance up to at least the end of November 2014 as given above.