Stuck on installing e/os on Galaxy S9

[piero]

Flashing the custom recovery take less than 2 minutes

Then :

@piero

…NOW COMES THE CRUTIAL STEP !..

• To get out of the Download mode you must Force Power Off your Samsung device,
  (on some old devices, unplug the device,)
  hold Volume Down + Power.
  release when you see the screen turn off…

• immediately Boot to Recovery before any other boot mode attempt,
  hold Volume up + Home + Power
  release Power when you see the very little blue line in the top of the screen…

…IT WAS THE CRUTIAL STEP !..

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you can read this custom recovery first boot explanation by @aibd

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You must successfully end with the “recovery-e” main screen :

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if you see something like that :

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It FAILED ! that is the Official Samsung Recovery screen !
Please re-read and retry the flashing process