It's not possible to go to the nether with worlds that the seeds were inputted. The portal won't activate. Also the amount of characters that can be placed in the seed slot is about 15 or so compared to about 50 in the previous versions. I'm using a Blu Dash 5.0!
MCPE-9417
Seeds Error with the Nether
Resolved
Duplicate
0
Resolving as a duplicate of MCPE-9659, in favor of the more general account there.