轉載 How to flash your Polaris using the microSD card

話說CRUISE的USB傳輸壞掉之後，因為要拿回原廠維修但是又礙於韌體是SUAAA大大的版本(真的好用)，擔心會因此失去了保固，所以終於找到可以用SD卡刷機的方式。

測試結果在CRUISE上可以正常刷機(官方版及SUAAA大大的版本都行)，後來又進一步測試發現ROM & RADIO都可以隨意刷機，但有一個重點就是要是HardSPL 或SuperCID才行。
單獨的SPL也有刷過，結果是只能升級不能降級。

原文為XDA上Taiseer999發布及網址如下，
http://forum.xda-developers.com/showthread.php?t=384084

How to flash your Polaris using the microSD card [Guide]

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**IMPORTANT***

Please make sure you have HardSPL on your device. And also make sure you have more than 50% of battery left or you can plug in a charger just to make sure there is no power failure. DO THIS AT YOUR OWN RISK.
please use a ROM that is meant to be used with the Polaris. Please note that this method is meant only for the HTC Polaris, for other devices please refer to their respective wiki.
Instructions
1.Get a MicroSD card that is formatted as Fat32. The card must be formatted as Fat32 otherwise it will not work. It doesn't need to be blank or freshly formatted (but it wont hurt if it is)
2.Find the ROM image you would like to use, normally named RUU_Signed.nbh, and rename it to "POLAIMG.nbh". Depending on the source of your ROM file, it may not be named RUU_Signed.nbh, but just rename the nbh file you obtained to POLAIMG.nbh
3.Copy the file POLAIMG.nbh to the root of your microSD card
4.Plug the card into the phone, then enter boot loader mode by pressing down the Camera button, then using the stylus, press and hold the RESET button at the bottom of the phone. Release both buttons once the bootloader screen appears.
5.You will first see a tri-color screen then the information on the card. Press power button to start flashing.
6.After all these are done, press the reset button located at the bottom of the phone to reset the device.