Sorry, Martian - but this will not help. If it would really be as easy as this the threads treating firmware questions and annex change procedures would not be as long as they are.
@laurens7: First download to your PC the latest English Recovery for annex B 7170 (as your actual fw is 29.... your box is annex B) from avm ftp server:
ftp://ftp.avm.de/fritz.box/fritzbox.fon_wlan_7170/x_misc/english/annex_b
Do the same just in case you have to fallback to your actual German version:
ftp://ftp.avm.de/fritz.box/fritzbox.fon_wlan_7170/x_misc/deutsch
NOW download TELEFONICUS archive "fritz_as_avme_newer.tar" (
www.ip-phone-forum.de/showthread.php?p=971638#post971638) to your PC and upload it to your box like a firmware upgrade -disregard any avm warnings and upload anyway.
(Do not reboot the box after this step. If your box reboots automatically don't worry if you don't get an interface as your box's language has changed to English but the firmware still remains German.)
Now run the English Recovery you downloaded before. Observe recovery procedure including preparing your network card THOROUGHLY and in ALL DETAILS - quite a few users are reporting again and again that recovery failed because they just missed a little detail.
Just in case: I'm not sure if you are really looking for an English language interface or if you (only) need to make your box work with "annex A" as your DSL line might be an analog one (going on with the German interface). Just for your information: English fw 29.04.57 does NOT offer the same variety of features as the German 29.04.57 does - even if avm gave them virtually the same fw numbers.
If you ONLY need to change the annex to A(analog) just download TELEFONICUS archive "fritz_as_annex_a_kernel_args_newer.tar" to your PC and upload it the same way as described before like a firmware upgrade to your box.