Brand           : acer
ProdName    : z520_aap_cus4
ProdModel    : Z520
Device          : acer_z520
AndroidVer   : 4.4.2
MTKxCPU   : MT6582
MTKxPRJ    : ALPS.KK1.MP1.V2.13

Firmware ACER Z520 BI atau Bahasa Indonesia, tested, ok backup via CM2

Bahan :

1.  Download Firmware Acer Z520 BI / BAHASA INDONESIA DUAL SIM atau Download disini
2.  Download Flash Tool DOWNLOAD DISINI
3.  Driver bila belum punya instal dulu driver mtknya
4.  Untuk tutorial flash via Flash tool bisa dilihat DISINI 
5.  Konfirmasi pass sms only 0822-1163-1565 (nomor ini hanya buat konfirmasi, BUKAN YANG DI ISI) , Mahar pulsa 10k

Firmware  Z520 yang lain no BI no password download via Mediafire

1. ACER Z520 WW GEN1 2SIM
2. ACER Z520 EMEA GEN1s 1SIM
3. ACER Z520 EMEA GEN1 2SIM
4. ACER Z520 EMEA_CUS1 2SIM
5. ACER Z520 EMEA_CUS1s 1SIM

Cara Flash Acer Z520 via Flash Tool

Log read Flash Acer z520 aap cus4
 Start  at : [3/7/2016 / 11:16:56 PM]
Operation : Read Flash [ v1.40 ]

1. Power Off Phone , Remove battery , Insert back
2. Insert USB cable. In some cases require hold BootKey

Wait for phone…
Phone found! [ 3 ]
Sync…
Inital regs read done
Boot Info :
BB_CPU_ID : 6582
BB_CPU_HW : CB00
BB_CPU_SW : 8A00
BB_CPU_SB : 0001
BB_CPU_NM : [MediaTek] MT6582_S00
Processing BROM stage
SecCfgVal : 0x00000000
BromVersion : 0xFF
BLVersion : 0x01
Preloader Status : Alive
Processing DA stage
DA Select done , sending
DA Ver : MTK_AllInOne_DA_v5.1540.01.01
NAND_ID : 00000000000000000000000000000000
eMMC_ID : 700100563130303038500D71D33342B1
DA Stat : v4.2 on BBID : 0x87
DA Sent. Configure setting now …
DA started successuflly
eMMC FlashIC initialized
[eMMC] : FLASH_VEN : 0070 , OEM : 0100
[eMMC] : FLASH_INF : [KINGSTON] , 80001
[eMMC] : FLASH_CID : 700100563130303038500D71D33342B1
[eMMC] : FLASH_EXT : 0x00400000 , 0x00400000 , 0x00400000
[eMMC] : FLASH_LEN : 0x00000001C3000000
[eMMC] : FLASH_UCP : 7216 MiB
INT RAM    : 0x00020000
EXT RAM    : 0x40000000
BOOT TYPE  : EMMC_FLASH_BOOT
SOC VERIFY : C1
Boot Ok!

Reading Flash Conent now …

Brand     : acer
ProdName  : z520_aap_cus4
ProdModel : Z520
Device    : acer_z520
AndroidVer: 4.4.2
MTKxCPU   : MT6582
MTKxPRJ   : ALPS.KK1.MP1.V2.13

[Read Ok] : preloader_wt96520a1.bin
[Read Ok] : MBR
[Read Ok] : EBR1
[Read Ok] : lk.bin
[Read Ok] : boot.img
[Read Ok] : recovery.img
[Read Ok] : secro.img
[Read Ok] : logo.bin
[Read Ok] : system.img
[Read Ok] : cache.img
[Read Ok] : userdata.img

[ScatCFG] : MT6582 / V1.1.1 / wt96520a1 / EMMC
FW Size : 1536 MiB
Scatter saved to : G:\andro3\ACER\z520 bi\MT6582__acer__Z520__acer_z520__4.4.2_z520_aap_cus4\

All done!