I had plan to upgrade my samsung Tab 1 (7 inch) to Lollipop. I got the fair enough idea to upgrate it from youtube videos. I was able to go to recovery mode by pressing up+power. I was able to go to download mode by pressing (down+power) button.
I got the information that I can upgrade it from SD card & choose to install from SD card from recovery mode. I assume it was successful if I could have tried that.
But before trying direct update to lollipop, I tried to download with odin 1.7. (My mistake)
I tried with modem, kernel & pit file. After doing that I was not able to come to download mode itself. It looks like I hard brick my phone.