Android noob desperatley needs help resurrecting his tablet

So last week I was messing around with SP Flash tool and tried to flash my phone's stock rom which I finally found on the internet because I have a uncommon model. So after flashing everything went ok, except for the fact that my phone refused to power on, I would plug it into a power source and it would tell me it's charging but refuse to power on, until now I thought the power button broke coincidentally. But, 10 mins ago I decided to mess around even more and did the same thing to my new perfectly working non-rooted tablet (for which I also installed usb drivers and got stock flash files). So here's what I did, it was out of batter and it powered down, so I plugged it into my laptop and I got the sound that it was detected. I opened Flash tools and went into memory test just to see if I got the same results as I did on my phone, I got an error that I have no idea what it said but basically I think it said it didn't detect my device and I should format it or something. So i plugged it out and it refused to turn on. I plugged it into AC charging and nothing happened, I pulled it in and out and tried to power it on but nothing is happening...
Can someone please help me, my tablet still has warranty so I can take it to the store and get it fixed, but I know now that my phone isn't broken physically. Any way, if I can get clear instructions on how to fix my tablet and or phone I would be grateful.
My phone is an Alcatel 4030x (running Android 4.1) and my tablet is a Lenovo Tab 2 A7-10 (running Android 5)
P.S - my tablet does not have a removable battery