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UCD90120: Unable to unlock flash for the device 'UCD90120RGCR'

Part Number: UCD90120

I am Vigita S. a Device Support Engineer from BPM Microsystems.

I am currently working on the device UCD90120RGCR. I am able to read the device using the command FDh. 

From the "Configuration Programming of UCD Devices.pdf", I understand that before programming the data flash area, we need to unlock the flash and erase it. And the command I get from the above mentioned pdf is, BlockWrite,0x7E,0xE2,0x050400000104 followed by BlockWrite,0x7E,0xE3,0x0400008820

But after sending the "0x0400008820", I am not receiving an acknowledgement from the device after the last byte 20h is sent.
Since I don't get an ack from the device, I need to know if I am using the right command sequence to unlock the device.
Kindly advice on this.
And also, kindly provide me with the latest programming manual for this device 'UCD90120RGCR'.