[Galaxy S 5 Android Development (Snapdragon)] K4P1:
I assume you are coming from android LP or lower.

Because of Android MM (6.0.1) user can choose between two options (for sdcard). You can google about it to get the idea and details of it.

1 ) Use external sdcard and "main" sdcard. It is like switching internal sdcard and external sdcard. All apps uses external sdcard as they were using internal sdcard in android LP (IMO one reason to do this is because of S6 and some others that didn't have external sdcard slot.

Benefits: User can choose phones storage size for apps, music etc. by simply buying high capacity SDXC card and place it to phone.

Disadvantages: User can't "hot swap" (remove sdcard) while phone is running. And usually (at least cheaper sdcards) speed is way lower that phones internal memory (sdcard).

2 ) Use external sdcard as removable card. Normally read-only support.

Benefits: User can unmount card while phone is running and copy files to/from it (as it were in previous android versions)

Disadvantages: Phones memory space is limited to size of internal sdcard size.

ps. I prefer option 2.

The name is generic name given when formatting card IMO.

Due to changes in android 6.0.1 the "old" ExtSdCard link is not used anymore.

Solution. install ROM with xposed framework and su (and other options as needed/required)

After phone is set up, download and install XInternalSD (and maybe Marshmallow SD fix) xposed module(s) to get rw access ro external sd.

Note: DON'T ENABLE FOR ALL APPS option !!!!

NOTE 2: As always, use only modules made for MM (6.0.1). Don't use sdfix for LP etc...

NOTE 3. Copy installable ROM zip file to internal sdcard and shut down phone. Then remove external sdcard and install ROM (remember to copy xXx.options.prop to the root of internal sdcard). This way phone doesn't install external sdcard to be used as "main" sdcard. After installation is done, you can plug external sdcard even while phone is running).

---------- Post added at 02:06 AM ---------- Previous post was at 01:52 AM ----------

Google for 'android restore imei'

Also did you wipe system, data etc. almost all partitions before flashing ROM.

Then one solution might save it (not 100€ sure, more like 50% sure).

At the bottom of xXx.options.props file is option:

--------------------------------------------------------------------------------------------

# CSC Selection. Allowed values:

# KCSC - Keep current CSC, recommended in most cases (automatic selection or copy your current CSC contents).

# You can force the use of natively supported CSC by typing (use UPPERCASE!):

# ALB, ALE, ARO, ATL, ATO, AUT, BGL, BTU, BVO, CHO, CMF, COO, CYO, DBT, DTM, EON, ETL, EUR, H3G, ILO, ITV, KSA, LUX, MEO,

# MET, MOB, MOT, MSR, NEE, NZC, OMD, OMN, ORX, PCI, PCW, PEO, PHE, PHN, PRO, ROM, SEB, SEE, SER, SIO, SWC, TDR, TEB,

# TEM, TEN, TMZ, TNZ, TOP, TPA, TPH, TSI, TSR, TTT, TUR, TWO, UPO, VD2, VDH, VDS, VIA, VIM, VNO, XEF, XEH, XEO, XTC, ZTO

CSC=KCSC

--------------------------------------------------------------------------------------------

The KCSC keeps current CSC, but if you have wiped its data, it can't be kept so you need to override it simply by editing this option.

In my case (I use it always):

CSC=NEE

---------- Post added at 02:23 AM ---------- Previous post was at 02:06 AM ----------

This is to all who are posting to this forum.

Please do not write something like: "My phone won't boot".

We can't help because we don't know basic things about your phones details, like:

- What phone model you have.

- What ROM/Kernel/modem... version did it have before

- What ROM/Kernel/modem... version you flashed

- Errors/error codes that might appear during/after flashing

- Possible xposed modules or apps that might be involved to problem

The more details you write the more accurate solution you might get.

In general it is better to write as much information as possible BUT NEVER give sensitive info like IMEI code, passwords etc.