ECHOE ROM comes from DeathHawk and is also more similar to Samsung’s S6 TouchWiz User Interface. The ROM is based on Samsung Galaxy Alpha stock 5.0 ROM with several additions. Aside from that, you can either get the full version of the ROM or the slimmed down version with some bloatware removed. Both the versions are extremely fast, stable and battery efficient.
Pre-Requirements (Reading It Beforehand):
Please backup the original system data (contacts, SMS, application data, etc.).
Please backup files to another location as the built-in storage (external storage or individual PC).
Custom Recovery Installed On Your Device.
Phone Battery Charged Above 70% At Least.
Instructions (How To Flash/Install):
Download ROM Galaxy S6
Boot into Recovery.
Clear Dalvik Cache.
Flash S6 ROM zip file