upgrade firmware

I saw http://www.gurux.fi/Gurux.DLMS.Client (Upgrade firmaware).
Which format have to be the new firmware?

Thanks,
Alessia

Hi Mikko,
I tried to update my Smart Meter's FW.
I took the code at http://www.gurux.fi/Gurux.DLMS.Client but I have an exception during Step2:

// Step 2: Initiate the Image transfer process.
readDataBlock(Client, Media, target.imageTransferInitiate(Client, Identification, data.length), reply);

GXDLMSException: 'Access Error : Device reports an unmatched type.'

How can i solve it?
Thanks,
Alessia

Hi Mikko,
I implement your suggestion, so I'm waiting 10seconds after this error.
But I still have a problem, after this time, each request to the meter gives me this answer: 7EA009030351D05A7E. Do you know what does it mean?

my code is here:

try
{
var replyForEachBLock = new GXReplyData();

foreach (var index in indexes)
{
ReadDataBlock(client.Method(imgTransfer, 2, enumerableBlocks[index], DataType.Array),
"try to send block " + index, replyForEachBLock);

resentBlocks++;
}
}
catch (Exception ex)
{
Console.WriteLine("Error in reply in ResendAllFailedBlocks; Try to reconnect");

Thread.Sleep(10000);
succeded = false;
}

GXDLMSData obisData = (GXDLMSData)client.Objects.FindByLN(ObjectType.Data, "0.0.1.1.0.255");
if (obisData == null)
throw new Exception("Obis not found");
try
{
GXReplyData reply = new GXReplyData();
ReadDataBlock(client.Read(obisData, 2), "read data", reply);

Console.WriteLine(reply.Value);
}
catch (Exception ex)
{
Console.WriteLine("hours : " + ex);
}