added important instructions

REAME.md

@@ -79,6 +79,19 @@ dtparam=audio=off
 exit 0
 ```
 
+=== Blacklist Modules
+
+```
+/etc/modprobe.d/raspi-blacklist.conf:
+blacklist spi-bcm2708
+blacklist i2c-bcm2708
+blacklist huawei_cdc_ncm
+blacklist sr_mod
+blacklist cdrom
+blacklist usb-storage
+```
+
+
 ### Einrichten GSM
 ```
 /etc/usb_modeswitch.d/12d1:157d:
@@ -94,6 +107,9 @@ SetStorageDelay=8
 
 Workaround fuer USB disconnects:
 
+In /boot/cmdline.txt folgendes anhaengen:
+dwc_otg.speed=1
+
 /etc/cron.d/reset_usb:
 #  Reset USB if device names disappear
 * * * * * root [ ! -c /dev/ttyUSB0 ] && /usr/local/bin/usb_off_on.sh 2>/dev/null