Dark Alex正式发布自定义固件3.90M33，新版改进如下：
- 3.80 -> 3.90
- M33免盘: 修复用"HOME"退出时卡住的问题Dark Alex正式发布自定义固件3.90M33，新版改进如下：
--------
安装需要:
- 3.52 M33-或更高版本的PSP

安装:
- 复制 UPDATE 文件夹到 /PSP/GAME/
- 下载索尼3.90官方升级程序,重命名为"390.PBP",放到同一个文件夹
  或者你可以通过wifi来下载安装程序
- 运行程序.安装结束后,按X或O来重启PSP

更新:
- 3.80 -> 3.90
- M33免盘: 修复用"HOME"退出时卡住的问题

其它更新:
- 自动检查idstorage的key,如有问题,自动修复
- 增加通过wifi下载3.90 PBP的代码
  注意这个代码还不是100%稳定, 当选择AP(热点)的时候可能死机.如果发生,手动重启并重新安装
- L+△可跳过电量检查
  如果你已经有了 390.PBP 持续按住按键知道你看见"Veryfing 390.PBP".
  如果 390.PBP 是通过wifi下载的,在下载结束时,按住这些按键

3.90 M33-1升级包.rar 下载链接:
http://www.fs2you.com/files/4757fd6e-d136-11dc-9bfe-0014221f4662/

3.90 M33 1.50核心补丁.rar 下载链接:
http://www.fs2you.com/files/953a3c35-d136-11dc-a32f-0014221f3995/


原文：
3.90 M33
--------
Requeriments:
- Installation requires a PSP with 3.52 M33-3 or higher.
Instructions
- Copy the UPDATE folder into /PSP/GAME/
- Get the 3.90 sony update from somewhere, and put it in same folder, with name "390.PBP".
  Alternatively, you can let the installer to download for you via wifi.
- Run it, the update will be done by Sony updater. At the end when you are asked to reboot the
PSP pressing X or O, do it.

Changes:
- 3.80 -> 3.90
- March33 NO UMD: fixed (yet another) bug related with exiting with home. (infinite semaphore wait)

Changes in updater:
- The degeneration check and correction of IDS keys happens too in 3.71 now.
- Added code to download 3.90 PBP from net via wifi.
  Note that his code is not yet 100% stable, it may crash when selecting AP. In that case,
  reinit the installer.
- L+triangle has been restored as method to bypass battery.
  If you already have 390.PBP keep those buttons pressed until you see "Veryfing 390.PBP".
  If the 390.PBP is being downloaded bia wifi, press those buttons at the end of download until
  you see the previous sentence.