Miui 8 7.7.20 Global Beta Rom for all Mi Devices

Miui 8 Supported Redmi 2, Redmi 2 Prime, Mi 3, Mi 4, Redmi Note 3 Qualcomm, Redmi Note 3 Special Edition, Redmi Note 4 MTK, Mi 4i, Redmi Note 2, Redmi Note 4G, Redmi Note Prime,  Mi Max 32G, Mi Max 64G/128G, Mi 2/2S, Mi 5, Mi 5s Plus, Mi Note, Redmi 3/Prime, Redmi 3S/Prime, Redmi Note 4 Qualcomm/Redmi Note 4X, Mi Note 2, Mi 5s, Mi MIX, Redmi 4/4X, Redmi 4A

Change-Log 7.7.20
Highlights
New - Switch for turning Battery saver automatically when charged (07-19)

Themes
New - 20 new themes, 94 new wallpapers, 64 new ringtones (07-13) (India)
New - 20 new themes, 44 new wallpapers (07-13)

Known Issues: 
1. If you upgrade to MIUI 8 Global Beta ROM 6.10.13 via Recovery from ROM 6.5.19 and earlier versions, there might be Contacts FC issue. Solutions: Enter "Settings" > "System Apps" > "Contacts" > "Organize contacts" > "Rebuild index data" and by select "OK" to solve the issue.

2. Update for Redmi 2 Prime suspended due to possible failures while updating.


Here are links of Miui 8 Global Developer Rom

Mi 5
Fastboot 1738M
http://ota.pt.miui.com/ota/7.7.20/gemini_global_images_7.7.20_20170720.0000.00_7.0_global_da57921656.tgz
Recovery 1443M
http://ota.pt.miui.com/ota/7.7.20/miui_MI5Global_7.7.20_d2ff195ec8_7.0.zip

Mi Max 32G
Fastboot 1631M
http://ota.pt.miui.com/ota/7.7.20/hydrogen_global_images_7.7.20_20170720.0000.00_7.0_global_40e2b7470e.tgz
Recovery 1339M
http://ota.pt.miui.com/ota/7.7.20/miui_MIMAXGlobal_7.7.20_3fdc91c907_7.0.zip

Redmi Note 3  Qualcomm
Fastboot 1515M
http://ota.pt.miui.com/ota/7.7.20/kenzo_global_images_7.7.20_20170720.0000.00_6.0_global_d6d415ab8a.tgz
Recovery 1215M
http://ota.pt.miui.com/ota/7.7.20/miui_HMNote3ProGlobal_7.7.20_3ab4b51626_6.0.zip

Redmi 3S
Fastboot 1713M
http://ota.pt.miui.com/ota/7.7.20/land_global_images_7.7.20_20170720.0000.00_6.0_global_c8c6c4e3be.tgz
Recovery 1389M
http://ota.pt.miui.com/ota/7.7.20/miui_HM3SGlobal_7.7.20_d1e9357714_6.0.zip

Mi Max 2
Fastboot 1944M
http://ota.pt.miui.com/ota/7.7.20/oxygen_global_images_7.7.20_20170720.0000.00_7.1_global_bd481cd5fc.tgz
Recovery 1382M
http://ota.pt.miui.com/ota/7.7.20/miui_MIMAX2Global_7.7.20_27ca75a357_7.1.zip

Note : It is recommended to flash this rom freshly do not flash over global rom however you can flash this rom over china rom only. for flashing guide visit here

Source :en.miui.com/thread-702577-1-1.html