No, you have to split the array to 32 bytes.
Write((unit)10, working1);
Write((unit)11, working2);
Write((unit)12, working3);
…..
Is it a hardware restriction to be necessary to erase the entire 128K ?
Yes, I believe so.
Application update works both thru TinyConfig and IFU
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Is the secure storage a separate chip ? I couldn’t find it on the schematics
No, it is one of sectors from internal flash.
It is not really secure if it is external, is it? 
my VS automatically update to version 2, and now, when i try to download to the FEZ T18 there are an error like “…uart.dll NULL”
this error persists with boards upgraded to GHIElectronics.TinyCLR.Core version 2.0.0 rc1
FEZ T18 non supportato con TinyClr 2.0
Now that we have posted V2 on the cloud, VS will try to update your extension and NuGets to the latest, which is not what you need in your case, since you are using an older device. All v1 downloads are still here Downloads