[linux-lvm] lvreduce used before resizing file system, what now?

[veleiro at openmailbox.org]

Hello,

I was following this guide 
https://help.ubuntu.com/community/ResizeEncryptedPartitions#Detailed_resizing_.2BAH4_Reducing_an_encrypted_partition 
on how to reduce the size of an lvm partition.  Its kind of confusing, 
so going from a ext4 420G partition to 390G partition, I did the steps 
in the wrong order:

sudo e2fsck -f /dev/mapper/ubuntu--vg-root
# worked
sudo lvreduce -L -30G /dev/ubuntu--vg/root
# data warning
sudo resize2fs -p /dev/mapper/ubuntu--vg-root 390g

i tried to undo this by
sudo resize2fs -p /dev/mapper/ubuntu--vg-root 420g # doesnt do anything, 
not enough blocks
sudo lvresize -l +30G /dev/ubuntu-vg/root #clearly didnt do anything or 
work either

Is there any procedures to get back to where i started at 420g OR to fix 
it for 390g?

Thanks!
veleiro