You need this Advan S7A tablet firmware in the form of a PAC to install the Android operating system or what is known as the flash process.
This flash file admin has tested himself and managed to solve the error that appears on the Advan s7a tab using UFI tools.
Connecting to Download port...Make sure the battery is fully charged before flashing !!!
Power off the phone, disconnect and reconnect the battery(if possible), Hold the VOL DOWN or VOL UP+DOWN, and connect the USB cable
Scanning Download port... Done
Detected SPRD U2S Diag (COM27)
Connection status: EHCI:HUB:HUB[#6]:USB 1.01 High-Speed
USB Driver: [DriverCoding Corporation] sprdvcom, version: 2.0.0.114, date: 6-27-2014
Boot id: SPRD3
Sending FDL ... Done
Scanning Download port... Done
Detected SPRD U2S Diag (COM27)
Connection status: EHCI:HUB:HUB[#6]:USB 2.00 High-Speed
USB Driver: [DriverCoding Corporation] sprdvcom, version: 2.0.0.114, date: 6-27-2014
Boot version: Spreadtrum Boot Block version 1.1
Change baudrate to 460800 ... Done
Sending NAND_FDL ... Done
Scanning Download port... Done
Detected SPRD U2S Diag (COM27)
Connection status: EHCI:HUB:HUB[#6]:USB 2.00 High-Speed
USB Driver: [DriverCoding Corporation] sprdvcom, version: 2.0.0.114, date: 6-27-2014
platform: sc8830, cpu abi: armeabi-v7a
manufacturer: ADVAN
board: sp7731gea, name: revo_3204
brand: ADVAN, model: S7A
build id: LMY47D, version: 5.1 [Lollipop] (S730G_S7A_SC7731G_MB_2.0_5.1_070C_V1.1_160606)
build description: revo_3204-user 5.1 LMY47D 473 dev-keys
platform: sc8830, cpu abi: armeabi-v7a
manufacturer: ADVAN
board: sp7731gea, name: revo_3204
brand: ADVAN, model: S7A
build id: LMY47D, version: 5.1 [Lollipop] (S730G_S7A_SC7731G_MB_2.0_5.1_070C_V1.1_160606)
build description: revo_3204-user 5.1 LMY47D 473 dev-keys
Factory reset...
Creating filesystem... Creating filesystem with parameters:
Size: 157286400
Block size: 4096
Blocks per group: 32768
Inodes per group: 4800
Inode size: 256
Journal blocks: 1024
Label:
Blocks: 38400
Block groups: 2
Reserved block group size: 15
A created filesystem with 11/9600 inodes and 1665/38400 blocks
Done
Downloading cache, size: 5.27 MiB... Done
Creating filesystem... Creating filesystem with parameters:
Size: 6163492864
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 23511
Label:
Blocks: 1504759
Block groups: 46
Reserved block group size: 367
A created filesystem with 11/376832 inodes and 50110/1504759 blocks
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