How to remove invisible bedrock in MCPE?

There is no way to remove invisible bedrock. I have tried everything I could on my mcpe server I have on plug pe. I used to have a map of the server and I surrounded it with invisible bedrock cause I thought you couldn't break anything behind it, but now I have redone my spawn and can't remove the bedrock and have no choice now but to start a new world. I have tried everything I could. I'm sorry but its true. You can lower the floor in the room you placed it in until you don't step into the bedrock.

I have mcpe on my phone, so I use the rapid build feature in mcpe master. All I do is make the app build a small line throught the invisible block, then break the line.

i escape by Invisible bedrock In two commands:
I Set spawnpoit on/under invisible bedrock (cordonates is on spawn point!) II say in cheat /setblock (cordonates) planks Exemple !
IF dont know, is my idea for pc for cordonates. But I know so minecraft at 11 years
you dont know as a genius in minecraft, sorry But this is working %100 for my experience ! If dont work a block to set try up or down to set cordonates! ex 11 is Y is your head at block try under as 10 or 9 because the situation! Need to post on youtube At minecraft pocket edition this with the link! Need To try (please read to the end is working 100% no ploblems are you read)
Message come from Romania! Sended at 21:43 06 07 2018 day | mount | year