On the Subject of Reverse Alphabetize

You know the alphabet, right? Dvoo, tvg ivzwb gl ovzim rg ztzrm!

The module displays a chalkboard with a letter written backward.

Find which rules in the table below DO NOT apply. If there is an odd number of rules that don’t apply, use the middle one. If there is an even number, use the modern English alphabet.

Select the left side of the chalkboard if the displayed letter matches the LAST letter in the string. If not, select the right side of the chalkboard. Then proceed with the next displayed letter and the previous letter in the string, etc., for 26 stages.

There are exactly three batteries	NZYIFSUJWBDGVCAHMXTKLQEPOR
There are exactly two ports	AOXBRYGHWFNLDMJQVZSKCTUPEI
A BOB indicator is present	ZPDYVKAUQWMCTLXJNHSGOFEIRB
There is an odd number of strikes (during initialization)	RYCBENFZVQTSLWPXMKAGIHJUDO
There is an odd number of indicators	ALDNUBSTVRXZOWFCIHEJGPQYKM
An FRK indicator is present	OMRSNCGTZYDFQAVPIBXHELKUJW
The first numeric digit of the serial number is odd	UHKTLEPQNJMIZOCDRWVSXFBAYG
There are exactly two indicators	EBUYZLRCDXWOKQIGTAMSNPHVFJ
There is an even number of strikes (during initialization)	YQMGRPFHSUNCEZTABVWKLDJIOX
There are at least three letters in the serial number	XBOJNYQUZFVALTKPGCWESRHIMD
There are less than two indicators on the bomb	TWGCYNBXQKAUDZEJIMROSLHFVP
The number of solved modules is less than five (during initialization)	KTPQBJCEISAYZNOUXGMRDWLHVF
There is no even digit in the serial number	DXUAGEHMCJTOQSLRWPFVZBINKY
There are more than thirty modules on the bomb	CBDJUHOVLFIKSXPZRWQGETYAMN
The number of battery holders is less than three	JIYEPUCAFKGNOQBWZDVLXMRTSH

If a strike is given, the module will reset back from the beginning. Some rules may differ now if the module is reinitialized.

The Chalk: Obverse & Reverse

Obverse	Reverse
A	A
B	B
C	C
D	D
E	E
F	F
G	G
H	H
I	I
J	J
K	K
L	L
M	M

Obverse	Reverse
N	N
O	O
P	P
Q	Q
R	R
S	S
T	T
U	U
V	V
W	W
X	X
Y	Y
Z	Z