Please check the values of GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES and
GL_IMPLEMENTATION_COLOR_READ_TYPE_OES with glGetIntegerv before using a format/type combination other than GL_RGBA, GL_UNSIGNED_BYTE with glReadPixels. GL_RGBA, GL_UNSIGNED_BYTE is the only combination that is guaranteed to always work.
Have you checked glGetError()?
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