Unable to execute BSL command!!!

G2553 uses Ver2.0x of BSL and does not support: TX BSL version nor Erase check
It also have bug where it can not erase all of info, you have to do one segment at time

What version a msp family have and its errata is very poorly documented.

How do you know RX password woks?, I think it answers with an ack regardless of correct password.
And unless you have dc16 0x000 at 0xffde location it will do a mass-erase and your password now changed to all 0xff

If your firmware have the 0x000, there is no harm to try both 0xff password first and then your firmware password 
incase you don't know if it's a empty chip or not, as  once you are in you stay in and incorrect password after that does not matter until next reboot.
 
I got all commands except what I mention above to work with my G2553 and a Silabs CP2110 using C#

"G2553 uses Ver2.0x of BSL and does not support: TX BSL version nor Erase check"
 Is there any document which says this??

"How do you know RX password woks?"

If I read data from target without sending the password,then i ll get an error, after passing password i can able to read.so password command is working(password is 0xff(32 times))

Now am able write data to target but while reading it back getting some garbage data (reading the data from the location where i had written)

Tony Philipsson said:

G2553 uses Ver2.0x of BSL and does not support: TX BSL version nor Erase check

Can someone confirm this??

(4) The erase check and TX BSL version commands are members of the standard command set in
BSLs V1.50 or higher but excluding 2.x BSLs

I guess you are relaying on a BSL programmer that someone else wrote?
But here is the structure I'm using to set it up (checksum is calculated later)

public bool RX_data_block(ushort address, byte[] arrayname)  // a data block written (max 250 bytes) to the mcu's Flash/Ram.
        {
            i = 0;
            bsl_length = (byte)(arrayname.Length+4);    // calculate new bsl length inlcuding  AL,AH,LL,LH + acctual data
            Array.Resize(ref TXbuffer, bsl_length+4+2); // add 4byte header and 2 bytes for checksum
            TXbuffer[i++] = 0x80;                   // Header
            TXbuffer[i++] = 0x12;                   // Command
            TXbuffer[i++] = bsl_length;             // Lenght
            TXbuffer[i++] = bsl_length;             // Lenght (repeated)
            TXbuffer[i++] = (byte)(address &0xff);  // Adress low
            TXbuffer[i++] = (byte)(address>>8);     // Adress high
            TXbuffer[i++] = (byte)(bsl_length-4);   // lengthLow (max 250)
            TXbuffer[i++] = 0x00;                   // LenghtHigh is always 0
            arrayname.CopyTo(TXbuffer, i);          // fill in data block
            UART_BSL();           
            return true;
        }