Slow Blinking Blue Light is as far as I get (EOS 5D classic)

[compupix]

I'm trying to install magiclantern-5Dc.111.Beta4 to my Canon EOS 5D (original).
I unzipped the file to a freshly formatted CF card.
I launched the firmware update process.
I received a long blue light then it started blinking slowly.
I turned off the power and pulled the battery.
I re-inserted the battery and powered up the camera.
The delete (trash) button doesn't do anything.
The menu button brings up the regular menu.
I tried a second and third time but no joy.
I remember reading something about a problem with certain camera serial numbers...
My camera's serial number is 0420102538.
Thanks,
Drew

[1%]

Did you make the card bootable after running the firmware update?

[compupix]

Thanks. The install instructions don't say anything about making the card bootable. (In fact it says "The installer FIR will make your CF card bootable for you")
I have since downloaded EOScard 1.32 and tried marking the card with two different settings:
1) Both EOS-Develop and Bootdisk and
2) just Bootdisk
Neither setting gets me past the slow blinking blue light.
I tried setting the boot-ability of the CF card between unzipping the zip to the CF card and inserting the card into the camera.
Thanks,
Drew

[compupix]

Still not working.
Help, anyone?

[hullie]

I had the same problem.
You have to remove the file "5dc.111.card_bootable.fir"  from the card, and flash again.
Than it wil work.