HP Microserver N54L XPEnology Upgrade (to DSM5.0-4493-update3)
Just upgraded both my N54L from previous XPEnology DSM4.2 to the current latest DSM5.0-4493-update3 
Been running the old XPEnology DSM4.2 never turn-off for more than 5 months now, so far so good both still kicking alive 
I have 2 other original Synology units (DS110j & DS213), been getting quite some updates from Synology past few months, the current latest DSM5.0-4493-upate3 seem settle down for few weeks without any further update, yet.
It's nice to see those XPEnology sifus out there continue to make the installation/upgrade process easier, they also managed to get the current latest DSM5 runs, so I guessed it's for me to upgrade both my N54L to DSM5 as well.
Basically I'm using resources from the following link, all credits & thanks to them, nice work 
It's pretty straight forward and easier now, I just follow the steps ...
Download the following boot image, DSM & tools:
Get a new USB (or format it to FAT32), use the Win32DiskImager application to prepare the new DSM5 bootup USB

Use the new USB to boot-up N54L, select Install/Upgrade option

Boot until seeing the following "DiskStation login" status :

Then go back to PC, launch the Synology Assistance application & search, saw my N54L at "Migratable" status
Right-click it to Install

choose the DSM5-4493 pat file image, following the screen to complete the setup


Wait patiently, the N54L will re-boot few times, DO NOT touch anything until it's fully completed !


Upgraded from DSM4.2 straight to DSM5.0-4493, done !!
!!
Next is to apply current latest Update3
Need to enable SSH login

Disable the auto-download update

Select the Manual Update, choose the Update3 pat image file, click OK 1 time then stop there !

PuTTY login to the N54L, must use "root" login ID, password is the admin password entered during DSM installation
Enter the following 2 command lines:
sed 's/flashupdateDeb/flashupdateDeb1/' /
mv /

Then go back to DSM, click OK to continue

Wait patiently until the update process complete


Update done 

Next, XPEnology + Plex media transcoding on HP DC7800 old PC 
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