N.B as far as I can tell alot of the A948E-15E20-11-0927 firmwares out there
are actually A948E-15E20-13-0927 mislabelled
including the one on the www.cyberhome-help.de website

Ok here goes you'll need the read.com program included in the following zip file.

1001read.zip

Ok download the zip file and copy the read.com to either the directory containing the vx.bin file
that you believe is A948E-15E20-11-0927 or to somewhere in your PATH i.e c:\windows

now go to the dos prompt and get into the directory that you've stored the vx.bin file

Type in

read vx.bin

press the alt key and H at the same time

The screen splits into 2 vertical with the hex representation on the left and the printable version on the right

Press the # key and type 041BD0 and hit enter

This will take you down to the line whose address starts 041BD0

the right hand side of the line I've put x's for unprintable characters

reads xxxxxxxxxSREV EI

and the following line reads

2E5131-0290- 7

and the next line reads

SREV NOIOC-CA:ED

and finally the next line reads

84.9 Exxxxxxxx

Ok so we have arranged in columns as I'm having trouble lining them up on the webpage

x x x x x x x x S R E V     E I
2 E 5 1 3 1 - 0 2 9 0 -       7
S R E V   N O I O C - C A : E D
8 4 . 9       E x x x x x x x x
                               
3 2 1 0 7 6 5 4 B A 9 8 F E D C

Now re-arrange all the columns so that the last line which isn't in the file reads 0123456789ABCDEF

and you'll get

x x x x x x x x V E R S I E    
1 5 E 2 0 - 1 3 - 0 9 2 7      
V E R S I O N   C - C O D E : A
9 . 4 8 E       x x x x x x x x
                               
0 1 2 3 4 5 6 7 8 9 A B C D E F

So as you can see if any one has a file that they believe is version ....11-0927

whose line at address #41BE0 starts 2E5131 then you actually have .....13-0927

Hopefully that clears that up.